Marijuana is not to be used before your brain full devolpes. Studies have already been done to prove that it can stunt you just like alcohol or nicotine can. Users probably get defensive because there are studies and proof all over the world that it is the safest drug. It was initially made illegal because tobacco reps paid off Senators . And there are no known recorded deaths from weed overdose. You literally just get tired and have the best sleep of your life.