Its an interesting point - well known high performers in many walks of life are documented drug users. To add to the list above, here are two more that im familiar with:

Stephen King has trouble recalling writing a number of his books during the eighties due to alcohol and cocaine abuse. [1]

Sigmund Freud was a cocaine abuser up until the point he started to become a more noted researcher [2]

[1] http://www.dailymail.co.uk/tvshowbiz/article-1178151/Stephen...

[2] http://www.nytimes.com/2011/07/24/books/review/an-anatomy-of...