Even a little marijuana may change teen brain, study finds

Low levels of marijuana use — as few as one or two times — may change the teen brain, according to a new study.
The study, which looked at the brains of 46 14-year-old girls and boys from Ireland, England, France and Germany, found that teenagers who reported using recreational marijuana just once or twice displayed increased volume on MRI images in numerous brain regions involved in emotion-related processing, learning and forming memories. The results of the study were publish