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

"Marijuana is the 800-pound gorilla in the room, when in fact, 295 Coloradans died two years ago of prescription drug overdoses," he notes. 
In 2012, 36 drivers who tested positive for marijuana were involved in fatal car crashes, according the Colorado Department of Transportation. And 19-year-old Levy Thamba jumped to his death after consuming six times the recommended dose of a marijuana edible in April 2014