We already do. Forget the synthetic pharmaceuticals, nothing is quite so effective as a cigarette, a strong cup of coffee, or a chocolate bar. You have to wonder why it is that most (if not all) ancient civilizations had some sort of drug tradition, whether it was smoking opium or eating mushrooms. If being straight-laced was such a good idea, how come the straight-laced societies didn't overrun all those drug-addled societies?

...of course, that's not to say modern medicine isn't useful. It's the reason that we know coffee + chocolate == good, cigarettes == bad. Still, there's something to be learned from history...