i like the one where they try to put a cool spin on it.
"i tried pot yesterday and today i tried to outrun the junkyard dog. im doing stupid things, and that aint me"

but seriously i heard a pretty good argument on it that when kids find out they were lied to about the effects of marijuana then they are more likely to believe they were lied to about more serious drugs like coke, meth, etc, and therefore more likely to do them. it makes sense to me.

and there was an anti heroine commercial awhile ago with a girl trashing a kitchen with a frying can as a metaphor for what heroine does to your brain body and life