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.
Links
[1] http://www.dailymail.co.uk/sciencetech/article-3051326/Marijuana-users-false-memories-Brain-scans-reveal-cannabis-smokers-live-reality.html
[2] http://rethinkpot.org/tags/brain
[3] http://rethinkpot.org/tags/biomedical
[4] http://rethinkpot.org/tags/youth
[5] http://rethinkpot.org/tags/memory
[6] http://rethinkpot.org/tags/study
[7] http://rethinkpot.org/tags/research