> Some of Watts's writings published in 1958 (e.g., his book Nature, Man and Woman and his essay "The New Alchemy") mentioned some of his early views on the use of psychedelic drugs for mystical insight. Watts had begun to experiment with psychedelics, initially with mescaline given to him by Oscar Janiger. He tried LSD several times in 1958, with various research teams led by Keith S. Ditman, Sterling Bunnell Jr., and Michael Agron. He also tried marijuana and concluded that it was a useful and interesting psychoactive drug that gave the impression of time slowing down. Watts's books of the '60s reveal the influence of these chemical adventures on his outlook.

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https://alanwatts.org/category/psychedelics/
https://www.researchgate.net/publication/289596946_The_psychedelic_adventures_of_Alan_Watts
https://www.jstor.org/stable/3479497