This letter in the Montgomery Advertiser is a mind-numbing illustration of the vivid imaginations that local anti-drug activists can frequently be found to possess:

Assume the government legalizes pot. It will be taxed (federal and state) and regulated for THC content. Do drug cartels just fold their tent? Hardly. Simply offer a more potent product at a lower cost -- tax-free, of course. Higher THC content is the goal of all serious pot smokers -- check out any issue of High Times, or the myriad of Internet sites offering more potent seeds.

Note to prohibitionists: the second you find yourself arguing that no one will buy legal pot, you've gone off the rails badly. If you wanna talk about the advertisers in High Times, what about the ones that make money hand over fist selling legal herbs that merely look like pot? Legal pot will be an extremely popular product among people who like pot. You don't have to worry about that.

And if you find yourself arguing that drug cartels can stay in business despite sudden widespread competition by simply improving their product and lowering their prices, maybe you should stop to consider how ridiculous that sounds. If they do that, they'll go broke overnight, hence you just accidentally stumbled across the exact reason why legalizing marijuana will annihilate the black market for pot.

It really shouldn’t be necessary to explain that drug cartels thrive on astronomical black market inflation. Everything they are and everything they do revolves around the massive drug monopoly that prohibition bestows upon them. If you take that away, they are nothing.

But if the fundamentals of black market economics continue to escape anyone, I suppose we could always just agree to legalize potent pot as well.