if you haven't heard it, the Pal Erdős story is interesting.
Not only he was a great mathematician, he was also an amphetamine user for most of his life.
In 1979, he accepted a bet from a friend about quitting drugs for a month (his friends _were_ worried about him being a druguser).
Erdös won the challenge, but felt very stupid for the duration of the thing, declared that mathematics had been set back by a month and happily went back to amphetamine use.
Not only he was a great mathematician, he was also an amphetamine user for most of his life.
In 1979, he accepted a bet from a friend about quitting drugs for a month (his friends _were_ worried about him being a druguser).
Erdös won the challenge, but felt very stupid for the duration of the thing, declared that mathematics had been set back by a month and happily went back to amphetamine use.