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Wikipedia said:According to Genius, the James Gleick biography, Richard Feynman experimented with LSD during his professorship at Caltech. Somewhat embarrassed by his actions, Feynman sidestepped the issue when dictating his anecdotes; consequently, the "Altered States" chapter in Surely You're Joking, Mr. Feynman! describes only marijuana and ketamine experiences at John Lilly's famed sensory deprivation tanks, as a way of studying consciousness. Feynman gave up alcohol when he began to show early signs of alcoholism, as he did not want to do anything that could damage his brain.