Crick is known as one of the fathers of genetics and won a Nobel Prize for his work. After he and his research partner made their discovery, they famously ran from the Cavendish Laboratory to the Eagle pub in Cambridge where they announced they’d discovered the secret of life. Turns out he was also tripping. LSD was at the time an experimental drug, and Crick used it to 'boost his powers of thought.' They were boosted, all right, when he deduced the double helix shape of DNA
Crick later admitted to using small doses of LSD from time to time. In the 1960s Crick supported an organization and movement to legalize cannabis. He even wrote a piece to The Times in 1967 about reforming drug laws.