just tell him that you don't like what his friends are doing...talk to him and see if he can talk to his friends about it and see if he can get them to stop...but if he starts doing it, and if u don't like drugs, then i would talk to him and if he doesn't stop i would get out of the relationship, but right now see if he can talk to his friends and get them to stop before he gets involved with it...but if nothing happens i would be careful and make sure that he doesn't get involved b/c if he does he would be throwing away his life so make sure he doesn't do what his friends are doing, he should do his own things, not be pressured into what his friends are doing...and this is coming from a 15 year old girl :)...but seriously just watch him and see if he can talk his friends out of doing it also...good luck!