Fuck yeah man, drugs, sex and rock and roll.
But really, I don't care if people want to do that, they can go ahead. On the other hand, drugs and alcohol (lol) can have an effect on people who are still developing, so I think it should still be illegal to sell these things to people who are underage.
EDIT:
I don't think ANY of them are bad, they can all just lead to undesirable consequences, but usually when enjoyed properly and safely, they likely won't.