The paper will be published Wednesday, August 27, 2014 in the Journal of Neuroscience. ... researchers used an MRI machine and the brains of 40 people between the ages of 18 and 25. They claim that the more marijuana a person smokes, the more those two neural regions get "damaged." Dr. Hans Breiter, a professor of psychiatry and behavioral sciences at Northwestern University Feinberg School of Medicine, co-authored the study. He says, "Anytime you find there's a relationship to the amount of marijuana consumed and you see differences of core brain regions involved in processing of rewards, the making of...