Got to agree with the other half on her last post. Rolling Stones, Beatles, Pink Floyd, The Doors..... All helped in some way or another by drugs...
http://www.youtube.com/watch?v=4CqBONuW70Y
Let's not forget the classic artists and musicians, most of them would have probably had a hand from Absinthe (banned throughout most of europe for the psychoactive ingredients until recent years) and/or Opium. I guess the point i'm making is that in one way or another in the "civilised" world almost everyone has been influenced by drugs