Disclaimer: I've never done any illegal drugs but I've know a number of potsmokers, many who've tried more serious drugs. I know one biker who destroyed his life with meth and heroine, but I've heard about countless others.
Ideologically as a libertarian (small "l") I think everything should be legal. But practically, as evil as the man-made drugs have become, they need to be illegal and battled. That said, I can easily enough draw the line between natural and man made. If it can be grown, it should be legal. If it's created by modern chemistry in a lab (even if that "lab" is in someone's basement like the meth lab they busted in my neighborhood) it should be illegal. Sorry, acid trippers.
I am 100% behind the
Montana Meth campaign, which is being exported to a number of other states. But the similar pot campaign is ridiculous and a waste of money.