I know exactly where the weed is grown, and who gets the money. It is in no way associated with cartels or terrorism. Your argument is also very hollow, because the problems you cite come from the prohibition of drugs, not the drugs themselves. And even if we throw logic and reason away and accept your premise as correct, then the same would apply to alcohol, tobacco, and pharmaceuticals.
Don't get me wrong, I can appreciate your concerns. But please don't allow your gross ignorance to stop your reasoning; think these things through. It isn't exactly rocket science as we have history to guide our policy. The prohibition on alcohol, and subsequent repeal, is a mirror image of what we face today.
Excuse me now as I get off my pulpit...