The problem is, using illicit substances means funding into a system that is far more corrupt than politicians or oil barons. Unless you're living on a commune growing your own stuff for your own personal use, then you've likely gotten it from somebody whose business involves theft, extortion, murder, and terror. Forgetting the whole "body is a temple" mindset (which is noble, but unlegislatable), this is the strongest case for not doing them AND for working to have the laws changed.

I'm in that freaky minority who doesn't do drugs and has no desire to start, but nonetheless wants them legalized. Remove the criminal element from it and half of our society's problems would go away. Sure there would still be addicts, but I hypothesize they'd be fewer, because there would be less of a desire for anti-social types to engage in the "bad" behavior to begin with. If an ounce of prevention is worth a pound of cure, dump more resources into education. If the common person had the level of education about some of these substances that I have, more people would eschew them as I do.

Then maybe if we didn't have our law enforcement, coast guard and troops fighting a war on drugs, we might actually be able to focus more of their energy on the assholes who actually want to kill us for existing.