I am so so sorry you have been through all this. I quit smoking MJ a month ago after seven plus years of daily use for Depression, because I will be getting drug tested. It helped me a whole lot. It did not make me rude at all- quite the opposite (it is not like alcohol or tranquilizers). It did make me lazy and groggy, but far less than the Klonopin I take every single day does, which I am fully addicted to and cannot get off of no matter how I've tried. You say he had traumatic head injuries and was in a coma? I'd look more deeply into that issue, and talk to some doctors who know how to treat that. It's possible that the MJ may have helped him at some time, but apparently - he's not doing well with it. BTW, teenagers are often rude, but you knew that. This must be very difficult for you. I wish you all the best.