Forget questions of legality. Stop and ask this question: Why do we as a society need more and more and MORE mind-altering substances to cope with life? Seriously. Is society headed in the right direction if almost everyone needs some type of external chemical influence just to get through the week? I already have an answer.
Citation needed.
> Is society headed in the right direction if almost everyone needs some type of external chemical influence just to get through the week?
Who are you to decide what the "right direction" is, for anyone but yourself? Right vs Wrong is a moral judgement, not a legal one. No one should have the right to tell me what I (or anyone else) can put into my body. On a similar note, I think assisted suicide should be legal as well, but that's a discussion for another day.