I really, feel for you here, BTW- it sounds like he COULD be somking the coke, known as freebasing. It's not really that common anymore since some {flippin} genius invented crack. I guess it's also possible he's somking herion, either way though, he's going down a long and lonesome highway. Have you thought about having an intervention of sorts. I would reccomend someone that has a fair amount of sobriety to help, but basically just get all his friends and close family together and point out what his behavior is doing to you. try to avoid the "this one time, you did this and that and that is really stupid" When talking about his behavior the more generalizations the better, pretty much.