We have to mention the famous mathematician Paul Erdős http://en.wikipedia.org/wiki/Paul_Erd%C5%91s http://en.wikipedia.org/wiki/Paul_Erd%C5%91s After 1971 h

We have to mention the famous mathematician Paul Erdős http://en.wikipedia.org/wiki/Paul_Erd%C5%91s http://en.wikipedia.org/wiki/Paul_Erd%C5%91s After 1971 he also took amphetamines, despite the concern of his friends, one of whom bet him $500 that he could not stop taking the drug for a month. Erdős won the bet, but complained that during his abstinence mathematics had been set back by a month: "Before, when I looked at a piece of blank paper my mind was filled with ideas. Now all I see is a blank piece of paper." After he won the bet, he promptly resumed his amphetamine use. He also liked coffee. Note: effective programming in the real world is absolutely not the same as mathematics - but some would argue that the essence of it is.