I was 18 when I started and so were a lot of my friends and none of us went on to be pill heads or anything like that. Yes that is a very real possibility that some people may go on to other things, but in general no they don't, one of my friends is now a cop, I went to college and now am a web designer. I was never exposed to any other drugs when buying and that's the real issue, some dealers sell other things than just weed, and they may be pressured into trying or buying other things.