Which apparently was the original reason behind the war on drugs in the first place. Source [1] [1] http://www.independent.co.uk/news/world/americas/richard-nix...

I'd imagine that's exactly what OP was referring to.

> It's just as likely that they aren't doing this because they bought into the gateway drug myth, but because they are waging a culture war.

Precisely.

Arizona's state legislature is sure giving that a try, though: http://www.azcentral.com/story/news/politics/legislature/201...