even if there is a correlation, how do we know it's not the welfare that causes the drug use - or that both being on welfare and using drugs are caused by a third factor such as a poor attitude toward life? [...] the question here is whether after legalization we'd be picking up the tab for many more of those exercising their rights to smoke - and the answer is that there's no evidence that we would. And your point is understood. After all, why would someone turn to drugs in the first place.
Right - and since there are multiple independent theories that could explain any correlation between drug use and being on welfare, it follows that such a correlation (if one exists, and no such evidence has been posted here) doesn't support any particular one of those multiple theories.
Actually. The point is that Libertarians on welfare should be an oxymoron but apparently it happens when drugs are involved.