Dumb report, ------booze, tobacco, injury's genetics and medial prescriptions can make changes in the brain.
This study as done on people that smoked pot 5 times a day, good grief they must have found these people at a weight watchers clinic for those over 500 pounds. Screw the cost for the pot, where did they get the money to buy food for the constant Munchies??
So they find some abnormal folks, do a study on them and find brain changes, wow good job, who would of thought, wonder what government gave the Scientists a $250,000 grant to come up with these findings???