Sounds like teetotaler urban legend to me - have any evidence?
I'm not really that interested; do your own research.
But you were interested enough to post the claim?
You're in luck - I've already done the research: No study finds a drop of more than 40% in drinking during Prohibition (http://en.wikipedia.org/wiki/Alcohol_during_and_after_prohibition).
Look, you don't need to justify your getting high to me.
I don't get high - but I'll keep that in mind.
Get some help
What is it you think I need help with?
Mental, just mental