What? I khat hear you?

Marginal Revolutions mentioned a couple days ago that there's a study showing that Khat (qat) may increase male fertility.

Khat is a natural methamphetamine that is commonly chewed in African and Middle Eastern countries. If you've ever read PJ O'Rourke's All The Trouble In The World, he talks about it:

They started chewing it before lunch but the high didn't really kick in until three in the afternoon. Suddenly the drivers would start driving into potholes at full speed. We called this the "qat hour".

I was curious to try this stuff, but it's apparently been illegal in the U.S. since 1993. Man, not only is the U.S. taking all the fun out of stuff, but they are making it harder to pop out shorties.