Babe-I know how that feels. I remember learning a few of my friends had certain connections to get a certain illegal substance a few years ago. Later on, I got over it and I just let them be. Truthfully, you can only advise your friends, and it's up to them if they'll take it into heart or ignore it.
Apparently, me and some friends of mine still remain the only students that hasn't smoke pot.
"The cynicism you refer to, I acquired the day I discovered I was different from little boys!~All About Eve