(IMAGE) University of Montreal Caption Contrary to some popular beliefs, marijuana is harmful to adolescent brains. Researchers at the University of Montreal and CHU Sainte-Justine children's hospital have found that targeting at-risk youth through school programmes can limit their use of this drug. Credit Credit: Lew (tomswift) Holzman. Licence: CC BY-NC-ND 2.0. Source: https://flic.kr/p/6CPRZF Usage Restrictions Respect terms of CC licence License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.