Casual marijuana use changes brain structures involved in reward, emotion and motivation

Even casual use of marijuana appears to cause significant structural changes in key brain structures of young adults, a new study finds. In a report in the April 16 Journal of Neuroscience, researchers from the MGH Martinos Center and Northwestern University describe finding differences between casual users of marijuana and non-users in the size, shape, and structure of brain regions involved with motivation, emotion and reward. Read more about the study here.