Research

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Title
Adolescent brains exposed to THC are at higher risk of psychiatric disorders
02/05/2024

THC exposure during adolescence may cause microglial cell death and brain changes, increasing schizophrenia risks in genetically susceptible individuals.
 
Earlier, a 2023 study found heavy marijuana use may trigger schizophrenia, particularly in young men. This study examined the health records of nearly 7 million Danish citizens and determined that up to 30% of schizophrenia diagnoses — around 3,000 in total — could have been prevented if young men hadn’t abused marijuana.


THC, Brain, Delta-8, Research
Subchronic toxicity of cannabis leaves on male albino rats
12/02/2023

Abstract Cannabis is the most commonly abused drug in the world. In Egypt, the Anti Narcotic General Administration showed that the narcotics problem costs the Egyptian economy approximately 800 million dollars annually. LD50, lethal dose that kills 50% of the treated animals, of the bango was determined and then selected groups of rats were given tenth of LD50 for 90 days.
All over the world, there is growing interest in the part played by drugs in traffic accidents, and how to investigate adequate measures to reduce their incidence.2 Africa is the second largest producer of herbal cannabis in the world.3 In Egypt, drug addiction is considered one of the serious problems that worry both people and government. It affects young people within their productive years. It may lead to many problems such as social maladaptation, decreased works productivity and job loss.4 ‘Bango’ is the name of cannabis leaves used in Egypt and North Africa.5
Conclusion In conclusion, the present study revealed the bad effects of the bango plant on different organs in animals. Bango abuse leads to severe effects on different organs and this may subsequently lead to apoptosis and fibrosis of the organs, and this depends mainly on the dose and duration of administration.


study, Research, rats
Boston Medical Center Psychiatrists Innovate to Treat Teenagers With Marijuana-Induced Psychosis
11/16/2023

When teenagers smoked marijuana back in 1995, the amount of THC, or active ingredient in the drug, was about 4%. But times have changed. With new methods of testing, growing, and regulating marijuana, teens now have access to cannabis with increasingly higher levels of THC. One study found that in 2017 the average potency of marijuana had increased to 17%. This increased potency, plus easier access to many forms of marijuana in recent years, has some dedicated healthcare professionals working to address the possible mental health effects marijuana use may be having on young users, including the risk for psychosis.


cannabis-induced psychosis, Delta-8, Research
CANNABIS: DRUG OF ABUSE AND THERAPEUTIC AGENT, TWO SIDES OF THE SAME COIN
05/27/2023

The evidence presented in this review allows us to conclude that Δ9-THC and CBD produce biphasic, dose-dependent effects on several physiological responses. The biphasic nature of cannabinoid effects highlights the need for a careful analysis of the dose ranges separating therapeutic from unwanted effects. Besides, Δ9-THC produces dependence and harmful effects, while CBD does not.
The available pharmaceutical formulations of these phytocannabinoids and related molecules have clear therapeutic effects; however, more research is needed to assure their efficacy and safety since their effects are complex. Several additional potential therapeutic applications, mainly for CBD, are being proposed which, however, still lack sufficient clinical and preclinical support. For this reason, caution is advised when using or prescribing cannabinoids.
Additional consideration deserves the fact that the ECS participates in the development of the central nervous system98. Therefore, the use of cannabinoid-based formulations for the medical treatment of children and adolescents experiencing brain developmental changes must be carefully examined, balancing the pros and cons of prescribing cannabinoid-based medications in every single case. Cannabis research field is expanding with the identification of new molecular targets, the characterization of undescribed phytocannabinoids, and novel findings related to the ECS99. In addition, consumption of synthetic cannabinoids as drugs of abuse represents a new challenge in addiction research100.


Potency, study, Research, THC levels
Association of Mental Health Burden With Prenatal Cannabis Exposure From Childhood to Early Adolescence: Longitudinal Findings From the Adolescent Brain Cognitive Development (ABCD) Study
12/01/2022

Conclusions and relevance: This study suggests that prenatal cannabis exposure and its correlated factors are associated with greater risk for psychopathology during middle childhood. Cannabis use during pregnancy should be discouraged.     


prenatal, Pregnancy, mental health, study, Research, 2023 Presentation Dr Berry
Sperm DNA methylation alterations from cannabis extract exposure are evident in offspring
11/20/2022

Conclusions: This is the first characterization of the effect of cannabis exposure on the entirety of the rat sperm methylome. We identified CE-associated methylation changes across the sperm methylome, some of which persisted despite a "washout" period. Select methylation changes validated via bisulfite pyrosequencing, and genes associated with methylation changes were involved in early developmental processes. Preconception CE exposure is associated with detectable changes in offspring DNA methylation that are functionally related to changes in gene expression and cardiomegaly. These results support that paternal preconception exposure to cannabis can influence offspring outcomes.     


study, Research, rats, offspring, heredity, 2023 Presentation Dr Berry
Placebo Response and Media Attention in Randomized Clinical Trials Assessing Cannabis-Based Therapies for Pain
11/16/2022

Findings  This meta-analysis of 20 studies of 1459 individuals found a significant pain reduction in response to placebo in cannabinoid randomized clinical trials. Media attention was proportionally high, with a strong positive bias, yet not associated with the clinical outcomes.
Meaning  These findings suggest that placebo has a significant association with pain reduction as seen in cannabinoid clinical trials, and the positive media attention may shape placebo responses in future trials.


Placebo, meta-analysis, JAMA, 2023 Presentation Dr Berry, study, Research
Cannabis legalization and cannabis-involved pregnancy hospitalizations in Colorado
03/01/2022

Research has found that prenatal cannabis use may adversely affect fetal growth and neurodevelopment, be associated with future learning and behavioral problems in children, and increase risk of neonatal morbidity. (Cornelius et al., 2002; Day et al., 1994; El Marroun et al., 2011; Fried and Smith, 2001; Fried et al., 1999; Fried et al., 2003; Fried et al., 1997; Goldschmidt et al., 2000; Goldschmidt et al., 2008; Goldschmidt et al., 2012; Metz et al., 2017; Noland et al., 2005; Willford et al., 2010; Ryan et al., 2018; El Marroun et al., 2018) Several US organizations, including the American College of Obstetricians and Gynecologists and the American Academy of Pediatrics, recommend abstinence from cannabis use during pregnancy. (Ryan et al., 2018; Gynecologists, T.A.C.O.O.A, 2020) Despite these recommendations, there are concerns that the trend of cannabis use during pregnancy will continue to increase as more states and countries legalize cannabis and allow for commercial sales through dispensaries. (Mark and Terplan, 2017)


Pregnancy, science direct, Research
Cannabis and Psychosis: Recent Epidemiological Findings Continuing the “Causality Debate”
01/01/2022

In summary, much of the available evidence supports the criteria of strength, consistency, biological gradient, and temporality for cannabis causing psychosis. Furthermore, supporting specificity, while many substances are known to induce psychosis, the risk for conversion to schizophrenia is greatest with cannabis-induced psychosis.


cannabis-induced psychosis, Research, Psychosis
Cannabis use may be associated with suicidality in young adults
06/01/2021

An analysis of survey data from more than 280,000 young adults ages 18-35 showed that cannabis (marijuana) use was associated with increased risks of thoughts of suicide (suicidal ideation), suicide plan, and suicide attempt. These associations remained regardless of whether someone was also experiencing depression, and the risks were greater for women than for men.
“Suicide is a leading cause of death among young adults in the United States, and the findings of this study offer important information that may help us reduce this risk,”


youth, suicide, NIH, study, Research
Association Between the Use of Cannabis and Physical Violence in Youths: A Meta-Analytical Investigation
06/01/2020

After screening 11,348 potential studies....These results demonstrate a moderate association between cannabis use and physical violence, which remained significant regardless of study design and adjustment for confounding factors (i.e., socioeconomic factors, other substance use). Cannabis use in this population is a risk factor for violence.


meta-analysis, Research
Cannabis Increases Propensity for False Memories
05/08/2020

To look for longer-term effects of cannabis, the experimenters called the subjects back a week later and tested them again on the word lists, this time with a few different dummy words thrown in. They also re-interviewed the subjects about the VR scenarios using a combination of old and new questions. As before, they found lower memory accuracy in the word-association test in those who had been intoxicated compared with sober participants. There were no statistically significant differences between the groups for the virtual reality scenarios, a result that Kloft says may indicate memory decay over time in all participants.


Research, memory, false memories
Reducing the risks of distortion in cannabis research
09/08/2019

But  the  lives  of  vulnerable  people  may  be  put  at  risk when  science  is  distorted  for corporate  or  ideological  ends.  As  noted,  several  USstates  responded  to the  much-hypedoriginal study of cannabis and opioid overdosesby authorizing the use of medical cannabis to treat  heroin-addicted  individuals.  Advice  that  opioid  users  should use medical  cannabis toreplace  opioid  agonist  therapies  (e.g.,  methadone,  buprenorphine) poses significant  risk because abrupt cessation of these medications dramatically increases the risks of an overdose death if users return to opioid use 


Research, Medical, risks, opioid
cannabis use to variation in the incidence of psychotic disorder across Europe
03/19/2019

In conclusion, our findings confirm previous evidence of the harmful effect on mental health of daily use of cannabis, especially of high-potency types. Importantly, they indicate for the first time how cannabis use affects the incidence of psychotic disorder. Therefore, it is of public health importance to acknowledge alongside the potential medicinal properties of some cannabis constituents the potential adverse effects that are associated with daily cannabis use, especially of high-potency varieties.


Research, study, Lancet, Potency, Psychosis, cannabis-induced psychosis
Cannabis use and driving-related performance
07/01/2018

We found that among young recreational cannabis users, a regular dose of cannabis had no effect on simple and learned tasks, but its use led to significant impairments on complex and novel driving-related tasks, as well as perceived driving ability and safety, for up to 5 hours after use. The present finding that the first 5 hours after cannabis use affected driving-related performance substantiates the recommendations of Canada’s Lower-Risk Cannabis Use Guidelines, which recommend waiting 6 hours after cannabis use before driving.30
 


Canada, Research, study, driving, youth
Medical Marijuana Users are More Likely to Use Prescription Drugs Medically and Nonmedically
04/17/2018

Conclusions: Our findings disconfirm the hypothesis that a population-level negative correlation between medical marijuana use and prescription drug harms occurs because medical marijuana users are less likely to use prescription drugs, either medically or nonmedically. Medical marijuana users should be a target population in efforts to combat nonmedical prescription drug use.


opioid, study, Research
Mood Fluctuation and Psychobiological Instability: The Same Core Functions Are Disrupted by Novel Psychoactive Substances and Established Recreational Drugs
04/14/2018

Many novel psychoactive substances (NPS) have entered the recreational drug scene in recent years, yet the problems they cause are similar to those found with established drugs. This article will debate the psychobiological effects of these newer and more traditional substances. It will show how they disrupt the same core psychobiological functions, so damaging well-being in similar ways.


Research, Psychoactive
Review of the public health risks of widespread cannabis use
04/08/2018

1. Legalizing cannabis has been shown to increase the rates of motor vehicle accidents.
2. Cannabis use is a risk factor for mental illness.
3. Inhaled Cannabis use is a risk factor for respiratory infections.
4. Cannabis use increases the rate of vascular disease. Cannabis is the third most often identified drug of abuse
5. Cannabis use during pregnancy has been associated with increased risk of adverse birth outcomes
6. Legalization of cannabis has been shown to increase cannabis exposure in the pediatric population.
7. Heavy cannabis use is associated with diminished lifetime achievements.
Doctors must educate the public about the potential harm cannabis causes with heavy, and possibly moderate, widespread use just as they do about the dangers of tobacco use. Tobacco use has declined in the United States in large part because of the knowledge the public now holds about its adverse effects, as opposed to legislative action.


Pregnancy, car crashes, mental health, pediatrics, Long-term, Doctors, Research, second hand smoke, smoking
"Positive" urine testing for Cannabis is associated with increased risk of traffic crashes
01/08/2018

bstract

Although recent Cannabis use is widely reported to be associated with drug-related traffic accidents, the evidence that Cannabis users show an increased risk of being involved in road crashes is still not unequivocally proved. The purpose of the present work is to provide an objective assessment of this hypothesis, by comparing the frequency of occurrence of positive urine analyses in drivers involved in traffic accidents (n = 1406) with that observed in a control population undergoing mandatory urine drug testing (n = 1953). Urine analyses for drugs of abuse were performed by screening immunometric techniques followed by confirmation with UHPLC-QQQ MS, adopting a cut-off concentration for THC-COOH of 15 ng/mL. A case was classified as "positive" when a driver admitted to hospital for road traffic injuries showed urine concentrations of THC-COOH higher than the cut-off. All samples showing positive results for any other controlled drug in urine or blood alcohol concentrations >0.5 mg/mL were excluded from the study. Subjects positive to THC-COOH, and negative to all the other tested substances were 116 in Group 1 (8.2%) and 16 in Group 2 (0.8%). Subjects resulting negative to any tested substances were 1290 in Group 1 and 1937 in Group 2. The frequency of THC-COOH detection in the two groups was compared by using the "chi square" test, which resulted = 119.57, i.e. highly significant (P <<< 0.01). The Odds Ratio of the two groups was =10.88, showing a high degree of association between the presence of THC-COOH in urine and the occurrence of traffic accidents (P < 0.0001). The presented data, proving a high degree of association between Cannabis use and the occurrence of traffic accidents with injuries of the driver, support the use of urine testing for Cannabis in the procedures for the issuing of the driving licence, particularly in the case of subjects formerly or presently using Cannabis. This finding looks even more relevant in the present times, because of the increasing success of the policies of legalization of Cannabis for medical and non-medical purposes.

 


Research, car crashes, drug testing
‘Medical’ marijuana is incompatible with mental health promotion
04/20/2017

Similarly, it can be anticipated that if introduced, the indications for the  use of medical cannabinoids would expand well outside of the initial indications. Hence, the medical profession cannot justify the use of medical cannabinoids that would be associated with an iatrogenic risk of serious adverse psychological events.  The use of medical cannabinoids for any purpose, including research under closely observed conditions, is incompatible with mental health promotion.


Research, mental health
Marijuana use and physical dating violence among adolescents and emerging adults: A systematic review and meta-analysis.
03/18/2017

Findings suggest that marijuana use is associated with a 54% increase in the odds PDV (physical dating violence) victimization, and a 45% increase in the odds of perpetration. CONCLUSIONS: Findings suggest that dating violence is a correlate of marijuana use, and that association is strongest among adolescents (vs. emerging adults) and girls (vs. boys).


meta-analysis, PDV, adolescent, Studies, Research, ncbi
Long lasting effects of chronic heavy cannabis abuse.
03/18/2017

The existence of hallucinations, delusions, and organic brain dysfunction in heavy cannabis users seems to be associated with cannabinoid levels in hair. The continuation of persistent symptoms 3 months after the discontinuation of cannabis abuse, was a remarkable finding. SCIENTIFIC SIGNIFICANCE: We provide evidence that chronic and heavy cannabis abuse results in long-lasting brain dysfunction in all users and in long-lasting schizophrenia-like psychotic symptoms in more than half of all users. These findings suggest a reevaluation of the current classification of cannabis as a "soft narcotic" which erroneously, therefore, is typically considered harmless. (Am J Addict 2017;XX:1-8).


ncbi, chronic, impaired, delusions, Long-term, Studies, Research
Marijuana Is Not Safe to Smoke, Researchers Say
02/14/2017

The mold and bacteria was so widespread and potentially dangerous that the UC Davis academics concluded that they cannot recommend smoking raw or dried weed. "We cannot recommend inhaling it," says George Thompson III, an associate professor of clinical medicine at the university who helped conduct the cannabis research.


smoking, Research, second hand smoke
Marijuana Violence and Law
01/17/2017

According to research studies, marijuana use causes aggressive behavior, causes or exacerbates psychosis and produce paranoias. These effects have been illustrated through case studies of highly publicized incidents and heightened political profiles.

Marijuana is currently a growing risk to the public in the United States. Following expanding public opinion that marijuana provides little risk to health, state and federal legislatures have begun changing laws that will significantly increase accessibility of marijuana. Greater marijuana accessibility, resulting in more use, will lead to increased health risks in all demographic categories across the country. Violence is a well-publicized, prominent risk from the more potent, current marijuana available.


Research, Journal of Addiction, crime, violence, mental health, withdrawal symptoms
Marijuana use may be linked to temporarily weakened heart muscle
11/14/2016

"This development of stress cardiomyopathy in younger patients who used marijuana suggests a possible link that needs to be further investigated," said Sahil Agrawal, M.D., co-author of the paper and also a chief cardiology fellow at St. Luke's.

Marijuana users were more likely than non-users to have a history of depression (32.9 percent vs. 14.5 percent), psychosis (11.9 percent vs. 3.8 percent), anxiety disorder (28.4 percent vs. 16.2 percent), alcoholism (13.3 percent vs. 2.8 percent), tobacco use (73.3 percent vs. 28.6 percent) and multiple substance abuse (11.4 percent vs. 0.3 percent). Because some of these can increase the risk of stress cardiomyopathy, the researchers adjusted for known risk factors to investigate the association between marijuana use and stress cardiomyopathy.


heart, Studies, Research, American Heart Association
Complexities in understanding and addressing the serious public health issues related to the nonmedical use of prescription drugs
09/01/2016

A common theme among every article in this issue is the overlap be- tween NMUPD, excessive drinking, and marijuana and other forms of substance use. In every investigation, nonmedical users were observed to have a history of using alcohol, marijuana, tobacco, and other psycho- active substances. Kalyanam, Katsuki, Lanckriet, and Mackey (2017)
Kalyanam, J., Katsuki, T., Lanckriet, G., & Mackey, T. K. (2017). Exploring trends of non- medical use of prescription drugs and polydrug abuse in the Twittersphere using un- supervised machine learning. Addictive Behaviors, 65, 289–295. http://dx.doi.org/10. 1016/j.addbeh.2016.08.019.


Studies, Research, Prescription, epidemic, 2017 Legislation
What Scientific & Medical Journals & Experts Say About Marijuana
08/31/2016

30 Referenced Resources


Arizona, Research
Marijuana Use: Detrimental to Youth
04/01/2016

In summary, marijuana use is harmful to children and adolescents.  For this reason, the American College of Pediatricians opposes its legalization for recreational use and urges extreme caution in legalizing it for medicinal use.  Likewise, the American Academy of Child and Adolescent Psychiatry (AACAP) recently offered their own policy statement opposing efforts to legalize marijuana. They similarly pointed out that “marijuana’s deleterious effects on adolescent brain development, cognition, and social functioning may have immediate and long-term implications, including increased risk of motor vehicle accidents, sexual victimization, academic failure, lasting decline in intelligence measures, psychopathology, addiction, and psychosocial and occupational impairment.” Thus the AACAP (a) opposes efforts to legalize marijuana, (b) supports initiatives to increase awareness of marijuana’s harmful effects on adolescents, (c) supports improved access to evidence-based treatment, rather than emphasis on criminal charges, for adolescents with cannabis use disorder, and (d) supports careful monitoring of the effects of marijuana-related policy changes on child and adolescent mental health.49 The College agrees with this position on marijuana.


American Academy of Pediatrics, youth, Research, Side-Effects
Adolescent Cannabinoid Exposure Induces a Persistent Sub-Cortical Hyper-Dopaminergic State and Associated Molecular Adaptations in the Prefrontal Cortex
01/04/2016

Thus, adolescent THC exposure induced behavioral abnormalities resembling positive and negative schizophrenia-related endophenotypes and a state of neuronal hyperactivity in the mesocorticolimbic dopamine (DA) pathway. Furthermore, we observed profound alterations in several prefrontal cortical molecular pathways consistent with sub-cortical DAergic dysregulation. Our findings demonstrate a profound dissociation in relative risk profiles for adolescent versus adulthood exposure to THC in terms of neuronal, behavioral, and molecular markers resembling neuropsychiatric pathology.  


Brain, adolescent, Research
Pot Science: Top Marijuana Findings of 2015
12/29/2015

Although studies are beginning to show that some ingredients in marijuana are likely to be helpful for people with certain conditions, the findings have yet to nail down the specifics about the dose, the frequency, the best form to take (such as getting the active compounds from edible products or smoking it), the risks from frequent use, and whether marijuana works as well as or better than other available treatments, Budney said.
Usage Doubles & Addiction Doubles:  Over this 12-year period, the estimated number of U.S. adults who had used marijuana in the previous 12 months grew from 4.1 percent in 2001 to 9.5 percent in 2013. Marijuana-use disorders, which include problems with drug addiction and dependence, also rose, increasing from 1.5 percent of the adult population in 2001 to 2.9 percent in 2013, the study showed.
 
 College students smoke more pot than cigarettes: The survey found that 5.9 percent of college students said they had smoked pot 20 or more times in the past month. For comparison, 5.2 percent of students reported they had smoked cigarettes 20 or more times in the past month, according to the study. 
Inaccurate Labeling Edibles: Only 13 of the 75 tested pot food products — such as baked goods, beverages and candy — bought from dispensaries in California and Washington state had labels that accurately listed the amount of tetrahydrocannabinol, or THC, 
Teen Brain:  The researchers found that teens who had smoked marijuana — even once — had smaller brain volume in the amygdala compared with teens who never tried pot.
 


Research, usage, college, Resource Paper, edibles, Teens
Medical Associations Response
10/11/2015

The American Medical Association (AMA) has opposed legalizing marijuana for medical use for many years due to the lack of evidence to support such action. In addition to AMA, the following medical associations also oppose legalizing marijuana or any of its components for medical use before FDA-quality evidence is available.


response, medical association, Research
Cannabis, cannabinoids and cancer – the evidence so far
10/11/2015

At the moment, there simply isn’t enough evidence to prove that cannabinoids – whether natural or synthetic – works to treat cancer in patients, although research is ongoing. And there’s certainly no evidence that ‘street’ cannabis can treat cancer.


cancer, hash oil, Research
ASAM Public Policy Statement on Marijuana, Cannabinoids and Legalization
09/21/2015
  • Prenatal exposure to marijuana has been shown to be predictive of psychotic symptoms in young adulthood.
  • Monitoring the Future survey reported a five-year decline in the perceived harm of regularly smoking marijuana, from 52.4% of high school seniors to 36.1%
  • Marijuana is the most widely used illegal drug in the United States and it is estimated that it is used by 61% of all persons suffering from a substance use disorder related to drugs other than alcohol.
  • The risk of developing addiction associated with cannabis use has been reported to increase to about 17% among those who start using marijuana in adolescence, and to 25-50% among those who smoke marijuana daily.
  • Smoke from marijuana combustion has been shown to contain a number of carcinogens and cocarcinogens, as well as many of the toxins, irritants, and carcinogens as tobacco smoke. 
  • Marijuana-infused edibles account for 45% of the legal marijuana marketplace.
  • AMA Marijuana has a high potential for abuse. It has no scientifically proven, currently accepted medical use for preventing or treating any disease process in the United States.

 

Number Using Opioids and Marijuana on the Rise

Chart: Colorado among states with growing heroin, prescription drug abuse problem 

Consistent with the past, in 2014 still only 47 percent of operators involved in traffic deaths were tested for drug impairment.

 


Pregnancy, addiction, cigarettes, edibles, Research, Studies
Public Policy Statement on Marijuana, Cannabinoids and Legalization
09/21/2015

Given these statistics.... is legalization worth the consequences....
Cannabis has been found to be the most frequently used drug in the U.S. after alcohol, tobacco and caffeine. 
The risk of developing addiction associated with cannabis use has been reported to increase to about 17% among those who start using marijuana in adolescence, and to 25-50% among those who smoke marijuana daily.
The long-term effects of marijuana use include altered brain development and cognitive impairment, including impaired neural connectivity in specific brain regions, decreased activity in prefrontal regions, and reduced volumes in the hippocampus.
Cannabis is most commonly consumed through smoking, a route of drug delivery that predictably has a variety of negative effects on pulmonary function. Smoke from marijuana combustion has been shown to contain a number of carcinogens and cocarcinogens, as well as many of the toxins, irritants, and carcinogens as tobacco smoke.  Additionally, marijuana smokers tend to inhale more deeply and hold their breath longer than cigarette smokers, which leads to a greater exposure per breath to “tar” (the carcinogenic solids in smoke). Regular smoking of marijuana, in the absence of tobacco, produces visible and microscopic injury to the large airways
http://www.asam.org/docs/default-source/publicy-policy-statements/mariju...


Research, legalization, asam, Long-term, Pregnancy, adolescent, youth, cigarettes
Why researching cannabis is difficult
09/09/2015

There are difficulties in researching the effects of cannabis.

  1. Many people who smoke cannabis also smoke tobacco. And users of cannabis often mix it with tobacco. This can make it difficult to know whether it is the tobacco, the cannabis, or both that has caused a cancer.
  2. The amount of THC in cannabis also varies. Some of the cannabis available today is much stronger than it was 20 years ago. These versions contain more THC.
  3. Another difficulty researchers have is in recruiting people who smoke cannabis into studies. Because cannabis is an illegal drug in many countries, people may be reluctant to take part in research. And if they do agree to take part, they may not say how much cannabis they actually smoke.

Research, cancer
Medicinal and Recreational Marijuana: What are the Risks?
07/31/2015

Brain abnormalities and memory problems were observed in these individuals in their early twenties, two years after they had stopped using marijuana. The cannabis users were noted to have striatal, globus pallidus, and thalamus changes showing these brain regions appearing to shrink and collapse inward. These individuals also had poorer working memory. The earlier the age of cannabis use, the more dramatic the brain changes and memory deficits were noted to be.
Not only does it appear that cannabis use itself is a potential precursor to future drug use, but the age of first use of cannabis and the frequency of cannabis use seem to also be predictors of future substance abuse issues. Studies have shown that over two-thirds of those under the age of 18 who have been admitted to a drug treatment program identify cannabis as their substance of choice.
” One important characteristic that defines a substance use disorder is “an underlying change in brain circuits that may persist beyond detoxification, particularly in individuals with severe disorder"


Teens, Research, Studies, Brain, addiction, anxiety, depression, Resource Paper
The Relationship Between Marijuana Use and Intimate Partner Violence in a Nationally Representative, Longitudinal Sample
07/14/2015

Adolescent marijuana use, particularly consistent use throughout adolescence, is associated with perpetration or both perpetration of and victimization by intimate partner violence in early adulthood. These findings have implications for intimate partner violence prevention efforts, as marijuana use should be considered as a target of early intimate partner violence intervention and treatment programming.


adolescent, crime, Domestic Violence, Research, USF, UF
How Cannabis Causes Paranoia: Using the Intravenous Administration of Δ9-Tetrahydrocannabinol (THC) to Identify Key Cognitive Mechanisms Leading to Paranoia
07/10/2015

The principal psychoactive constituent of cannabis is Δ9-tetrahydrocannabinol (THC). THC administered intravenously is characterized by the appearance of psychopharmocological effects within 5 minutes, which continue for at least 90 minutes, providing an excellent experimental window.[12] In within-subjects tests with nonclinical volunteers, D'Souza, in particular, has shown that intravenous administration of THC causes schizophrenia-like symptoms, perceptual disturbances, anxiety, and impaired working memory (eg, Morrison et al[13] and D'Souza et al[14,15]). Similar but more pronounced results were found in patients with schizophrenia.[15]


Schizophrenia, paranoia, Studies, Research
Medical marijuana and children don't mix, most Americans say.
07/08/2015

However, there is little science about the safety or efficacy of treating children with medical marijuana. Research also indicates that the brains and nervous systems of children and adolescents are especially vulnerable to adverse effects of marijuana use, a concern raised by the American Academy of Pediatrics and American Academy of Child and Adolescent Psychiatry.  Poll


Research, Children
ACOG: Doctors Should Urge Against Prenatal Marijuana Use
06/25/2015

Studies show that children exposed to marijuana in utero have lower scores on tests of visual problem-solving, visual and motor coordination, and visual analysis, compared with children not exposed to the drug, the report states. Prenatal marijuana exposure also has been associated with decreased attention span and behavioral problems. The nervous system of a human fetus can respond to the chemicals in marijuana within 14 weeks of gestation, and studies have shown that 14-year-olds are more likely to be marijuana users if their mothers used the drug during pregnancy.


Pregnancy, Doctors, Research
Cannabinoids for Medical Use A Systematic Review and Meta-analysis
06/20/2015

A systematic review of the benefits and adverse events (AEs)
 
A total of 79 trials (6462 participants) were included; 4 were judged at low risk of bias. Most trials showed improvement in symptoms associated with cannabinoids but these associations did not reach statistical significance in all trials. Data about AEs were reported in 62 studies (127 reports).
 
There was an increased risk of short-term AEs with cannabinoids, including serious AEs. Common AEs included dizziness, dry mouth, nausea, fatigue, somnolence, euphoria, vomiting, disorientation, drowsiness, confusion, loss of balance, and hallucination.
 
Four (5%) trials were judged at low risk of bias, 55 (70%) were judged at high risk of bias, and 20 (25%) at unclear risk of bias (eAppendix 13 in Supplement 2) The major potential source of bias in the trials was incomplete outcome data. More than 50% of trials reported substantial withdrawals and did not adequately account for this in the analysis.
 
Common AEs included asthenia, balance problems, confusion, dizziness, disorientation, diarrhea, euphoria, drowsiness, dry mouth, fatigue, hallucination, nausea, somnolence, and vomiting.
 
There was no clear evidence for a difference in association (either beneficial or harmful) based on type of cannabinoids or mode of administration. Only 2 studies evaluated cannabis.  There was no evidence that the effects of cannabis differed from other cannabinoids.
 
An additional limitation of many included studies was their very small sample sizes.
 
Future studies should assess patient-relevant outcomes (including disease-specific end points, quality of life, and AEs) using standardized outcome measures at similar time points to ensure inclusion in future meta-analyses.
 
Future trials should adhere to the CONSORT (Consolidated Standards of Reporting Trials) reporting standards197 and ensure that appropriate methods are used for randomization, allocation concealment, patient and outcome assessor blinding, handling of withdrawals, and avoiding selective outcome reporting.


meta-analysis, Research, 2017 Legislation
Marijuana Use and PTSD among Veterans
06/05/2015

Marijuana use for medical conditions is an issue of growing concern. Some Veterans use marijuana to relieve symptoms of PTSD and several states specifically approve the use of medical marijuana for PTSD. However, controlled studies have not been conducted to evaluate the safety or effectiveness of medical marijuana for PTSD. Thus, there is no evidence at this time that marijuana is an effective treatment for PTSD. In fact, research suggests that marijuana can be harmful to individuals with PTSD.


Veterans, PTSD, mental health, Studies, Research
Clearing the Haze
06/05/2015

The Gazette kicks off a four-day perspective series, "Clearing the Haze," that examines health, social, regulatory and financial issues associated with the world's boldest experiment with legal marijuana. 
The ugly truth is that Colorado was suckered. It was promised regulation and has been met by an industry that fights tooth and nail any restrictions that limit its profitability. 


Research, regulation, crime, addiction, Colorado
Research Shows That Any Dose of Alcohol Combined With Cannabis Significantly Increases Levels of THC in the Blood
05/25/2015

Experts agree, however, that the combination of cannabis and alcohol raises the chance of crashing more than either substance by itself. In a study of 1,882 motor vehicle deaths, the U.S. Department of Transportation found an increased accident risk of 0.7 for cannabis use, 7.4 for alcohol use, and 8.4 for cannabis and alcohol use combined.


alcohol, Research, vehicle
Smoking marijuana may cause early puberty and stunts growth in boys
05/20/2015

Boys who smoke marijuana go through puberty earlier but grow more slowly than those who have never smoked the drug according to a study presented today at the European Congress of Endocrinology in Dublin, Ireland. The findings will lead to a better understanding of the dangers of drug abuse on growth and development of children.


youth, Studies, Research, puberty
Marijuana users may have ‘false memories’
04/22/2015

Participants in a study who had used the drug daily for around three years in their teens had an abnormally shaped hippocampus by the time they were in their early 20s.
They also performed around 18 per cent worse in long-term memory tests than individuals who had never touched the drug.


Brain, Biomedical, youth, memory, Studies, Research
Letter from American Epilpsey Society
03/22/2015

A study by a team from Children's Hospital Colorado that was presented during the AES Annual Meeting in December 2014 and has recently been accepted for publication in the journal Epilepsy & Behavior, found that artisanal "high CBD" oils resulted in no significant reduction in seizures in the majority of patients and in those for whom the parents reported improvements, these improvements were not associated with improvement in electroencephalograms (EEGs), the gold standard monitoring test for people with epilepsy.

 

Additionally, in 20% of cases reviewed seizures worsened with use of cannabis and in some patients there were significant adverse events. These are not the stories that you have likely 

heard in your public hearings, but they are the reality of practitioners at Children's Hospital Colorado who have cared for the largest number of cases of children with epilepsy treated with cannabis in the U.S.


Charlotte's Web, epilepsy, Legislation, Colorado, Studies, Research
The Impact of Marijuana Policies on Youth: Clinical, Research, and Legal Update
03/01/2015

·        These consequences include impaired short-term memory and decreased concentration, attention span, and problem solving, which clearly interfere with learning. Alterations in motor control, coordination, judgment, reaction time, and tracking ability have also been documented; these may contribute to unintentional deaths and injuries among adolescents (especially those associated with motor vehicles if adolescents drive while intoxicated by marijuana).
·        Negative health effects on lung function associated with smoking marijuana have also been documented, and studies linking marijuana use with higher rates of psychosis in patients with a predisposition to schizophrenia have recently been published, raising concerns about longer-term psychiatric effects. New research has also demonstrated that the adolescent brain, particularly the prefrontal cortex areas controlling judgment and decision-making, is not fully developed until the mid-20s, raising questions about how any substance use may affect the developing brain. Research has shown that the younger an adolescent begins using drugs, including marijuana, the more likely it is that drug dependence or addiction will develop in adulthood.
·         A recent analysis of 4 large epidemiologic trials found that marijuana use during adolescence is associated with reductions in the odds of high school completion and degree attainment and increases in the use of other illicit drugs and suicide attempts in a dose-dependent fashion that suggests that marijuana use is causative.


youth, American Academy of Pediatrics, AAP, Studies, Research
Researchers warn of “significant link” between marijuana and mania
02/16/2015

New research out of Britain’s Warwick University has found a “significant link” between marijuana use and mania, which can range from hyperactivity and difficulty sleeping to aggression, becoming delusional and hearing voices



 


Research, England, adolescent, mania, Studies
Marijuana and Opioid "Cross Talk" Risks for the Born, the Unborn
02/09/2015
madras, Research, powerpoint, opioid, Pregnancy
Medical Marijuana: The State of the Science
02/06/2015

Medical cannabinoids are here to stay, but intellectual honesty is imperative if we are moving toward exploiting their potential benefits. Owing to rising THC concentrations of products, "medical" marijuana is rarely good medicine. This review has identified the dangers associated with whole­plant marijuana, whether used for recreational or for supposedly medical purposes.


Studies, Research, medscape, mental health, Side-Effects, heart, lungs, body, Brain, youth, cannabis, Resource Paper
The Impact of Marijuana Policies on Youth: Clinical, Research, and Legal Update
01/26/2015
youth, clinical, Research, legalization, pedestrians
Medical Marijuana May Worsen PTSD Symptoms, Increase Violence. Medscape. Dec 15, 2014.
12/16/2014
Research, PTSD, Veterans, Studies
Long-term effects of marijuana use on the brain
10/13/2014
Long-term, Side-Effects, Brain, Research, Studies
What has research over the past two decades revealed about the adverse health effects of recreational cannabis use?
10/07/2014
Studies, Research, recreational
Medical marijuana laws in 50 states: investigating the relationship between state legalization of medical marijuana and marijuana use, abuse and dependence.
08/01/2014
Research
Birth outcomes associated with cannabis use before and during pregnancy.
08/01/2014
Pregnancy, Research
Pot Legalization vs. Science
07/30/2014
legalization, Research
Comparing Alcohol and Marijuana: Seriously
07/27/2014
alcohol, Research, youth
Medical Marijuana as a new herbalism (Part 1)
07/07/2014
Gorbski, Studies, Research
The Marijuana Report
07/07/2014
Research, national, Studies, article
Two 24-Week Phase 3 Studies of Lumacaftor in Combination with Ivacaftor Met Primary Endpoint with Statistically Significant Improvements in Lung Function
06/24/2014
Cystic Fibrosis, FDA, Research
NIDA review summarizes research on marijuana’s negative health effects
06/19/2014

The reviewers consider areas in which little research has been conducted. This includes possible health consequences of secondhand marijuana smoke; the long-term impact of prenatal marijuana exposure; the therapeutic potential of the individual chemicals found in the marijuana plant; and effects of marijuana legalization policies on public health.


Research, Studies, addiction, second hand smoke, chemicals
Medical marijuana laws in 50 states: investigating the relationship between state legalization of medical marijuana and marijuana use, abuse and dependence
06/13/2014

States that legalized medical marijuana had higher rates of marijuana use. Future research needs to examine whether the association is causal, or is due to an underlying common cause, such as community norms supportive of the legalization of medical marijuana and of marijuana use.


legalization, youth, Studies, Research
Man's fertility, Research finds....
06/05/2014
health, men, Research
NIDA review summarizes research on marijuana’s negative health effects
06/05/2014

The authors review literature showing that marijuana impairs driving, increasing the risk of being involved in a car accident and that these risks are further enhanced when combining marijuana with alcohol.


health, car crashes 2, Impairment, Research
Casual marijuana use linked with brain abnormalities, study finds
04/15/2014

For the first time, researchers at Northwestern University have analyzed the relationship between casual use of marijuana and brain changes – and found that young adults who used cannabis just once or twice a week showed significant abnormalities in two important brain structures.


Research, Brain, young adults, Studies
Heavy, Frequent Cannabis Use Linked to Mental Illness
04/03/2014

A new study suggests people with mental illness are more than seven times as likely to use marijuana weekly than people without a mental illness.

In total, 4.4 percent of individuals with a mental illness in the past 12 months reported using cannabis weekly, compared to 0.6 percent among individuals without any mental illness.

Cannabis use disorders occurred among 4 percent of those with mental illness versus 0.4 per cent among those without.

Researchers also noted that, although cannabis use is generally higher among younger people, the association between mental illness and cannabis use was pervasive across most age groups.


Research, addiction, mental health, usage
Cannabis During Pregnancy Impairs Baby's Brain Development
01/28/2014
Pregnancy, Research
Epilepsy experts call for more research into medical marijuana
01/22/2014
epilepsy, Research
Marijuana and Drugged Driving
06/11/2013

Institute for Behavioral and Health- 
The threat to public safety on the roadways posed by marijuana-impaired driving has been pushed to the top of nation’s agenda by the legalization of marijuana in Colorado and Washington as well as by the legalization of “medical” marijuana in 18 states and the District of Columbia. Marijuana has significant impairing psychological and physiological effects on driving. 


car crashes 2, impaired, IBH, Research, Studies, car crashes
Psychomotor Function in Chronic Daily Cannabis Smokers during Sustained Abstinence
01/02/2013

Conclusions/Significance: Sustained cannabis abstinence moderately improved critical tracking and divided attention performance in chronic, daily cannabis smokers, but impairment was still observable compared to controls after 3 weeks of 

abstinence. Between group differences, however, need to be interpreted with caution as chronic smokers and controls were not matched for education, social economic status, life style and race.


Studies, Research, chronic
Acute cannabis consumption and motor vehicle collision risk: systematic review of observational studies and meta-analysis
12/11/2012

Acute cannabis consumption is associated with an increased risk of a motor vehicle crash, especially for fatal collisions. This information could be used as the basis for campaigns against drug impaired driving, developing regional or national policies to control acute drug use while driving, and raising public awareness.


Studies, Research, car crashes, meta-analysis, Fatalities
Effects of Marijuana on the Fetus and Breastfeeding Infants.
09/18/2012
Pregnancy, Research
If You Thought Marijuana was Harmless, Medical Researchers Have News for You
04/01/2012

As expected, prescription cannabinoids are effective antiemetics and appetite stimulants, and some studies report their effectiveness as adjunct therapy in chronic pain syndromes, spasticity, and glaucoma. Similar results are reported by the few studies of smoked cannabis plant for these same indications. As noted earlier, safe and effective alternative treatments for all these syndromes are available.  Studies assessing psychological aspects of smoked cannabis and prescription cannabinoids uniformly report undesired effects: acute psychosis, poorer prognosis of chronic psychosis, or cognitive dulling in medical patients. 


health, addiction, pills, youth, Research, social costs
Legalization, Decriminalization & Medicinal Use of Cannabis:A Scientific and Public Health Perspective
03/01/2012
Research, Studies, Psychosis, Glaucoma, mental health, organs, risks
Association of Cannabis Use in Adolescence and Risk of Depression, Anxiety, and Suicidality in Young Adulthood
02/16/2010

Conclusions and Relevance  Although individual-level risk remains moderate to low and results from this study should be confirmed in future adequately powered prospective studies, the high prevalence of adolescents consuming cannabis generates a large number of young people who could develop depression and suicidality attributable to cannabis. This is an important public health problem and concern, which should be properly addressed by health care policy.


anxiety, depression, suicide, study, meta-analysis, Research, 2023 Presentation Dr Berry
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