All I know is that Bill Hicks has a point in his stand-up comedy. Quote below...

"See, I think drugs have done some *good* things for us, I really do. And if you don’t believe drugs have done good things for us, do me a Favor: go home tonight and take all your albums, all your tapes, and all your cd’s and burn em’. 'Cause you know what? The musicians who’ve made all that great music that’s enhanced your lives throughout the years...
Rrrrrrrrrrrrreal fucking high on drugs."
--Bill Hicks

Yeah, sure he was. See all the smoke from the bong in the background?