I've had cocaine, but I don't like it. The Beatles had lots of it in their day, but it's a dumb drug, because you have to have another one 20 minutes later. Your whole concentration goes on getting the next fix. Really, I find caffeine is easier to deal with. … A little mushroom or peyote is not beyond my scope, you know, maybe twice a year or something. You don't hear about it anymore, but people are still visiting the cosmos. We must always remember to thank the CIA and the Army for LSD. That's what people forget. … They invented LSD to control people and what they did was give us freedom. Sometimes it works in mysterious ways its wonders to perform.

Playboy interview (1980)