Marijuana worse for teen brains than alcohol, study finds

teens passing marijuana joint(NBC News, October 3) Marijuana use causes more long-term damage to teen brains than alcohol use, according to a new study entitled “A Population-Based Analysis of the Relationship Between Substance Use and Adolescent Cognitive Development.”

The study – completed by researchers at the University of Montreal – followed 3,800 Montreal teens over the course of four years. As part of the study, teen participants were questioned about their marijuana and alcohol use, and took computer-based cognitive tests.

They found that marijuana had more of an effect on the teens’ skills, memory and behavior than alcohol.

The findings were published in the American Journal of Psychiatry. Read more.