On another messageboard that I read/write to, there is an intermittent debate about the inevitability of teens drinking, smoking pot, or doing other drugs.  Parents who post that their child is smoking pot are reassured that "most teens do it", and parents (like me) who believe their teens are not are called "naive" and are told they have their heads in the sand.  This is a gut-reaction issue for me on two levels.  First, there's this general belief that in the 60s and 70s "everyone did it" and "we turned out OK".  Since I knew many kids (including me, my DH, and many of my friends) who didn't, I know it wasn't "everyone", even if it was very common.  Second, I have a 16 year old - she's basically a "straight edge".  When she hears "everyone does it", I worry she'll think it's just "the thing to do" and not a choice made by a minority of teens.