Daily marijuana use doesn't really change brains of adults or teens, study finds

Phoenix New Times (US)
Monday, February 2, 2015

Late last year, the press and marijuana-legalization opponents gave a lot of attention to a study suggesting that daily marijuana use shrinks users' brains. New research indicates that claim and other reports of cannabis-caused changes to brain structure simply aren't true. The new study, "Daily Marijuana Use Is Not Associated with Brain Morphometric Measures in Adolescents or Adults," published in the latest edition of the Journal of Neuroscience, suggest that alcohol use was responsible for previous studies finding brain changes.