PKD wrote a lot of great books really quickly by relying on amphetamines, heavily. This had a major contribution to the far out mental state he was in towards t

PKD wrote a lot of great books really quickly by relying on amphetamines, heavily. This had a major contribution to the far out mental state he was in towards the end of his life, and it's actually quite sad. I say this as a huge PKD fan. Ubik and A Scanner Darkly both had a profound impact on me.