Its not just that there's more to life than being high, it is whether society, in the form of government, is going to send a signal to everyone that its just fine to ingest mind-altering drugs. It'll do wonders for our competitiveness, and wonders for our military, police, etc. to have a doped-up society.
You know, libertarian ideas sound great in theory, but a few of them are utter crap when it comes to practice.
I would like to clarify my position...while I'm inclined to lean toward a libertarian view of some things, the legalization of drugs is not something I would strongly advocate. It's certainly not a priority.