Here Leary made his case for the benefits of psychedelic drug use, noting that millions of Americans have had hallucinogenic experiences: "We include marijuana smokers, the adepts in hatha yoga, meditators, peyote eaters, mushroom eaters, the LSD cult, and those millions who have had an involuntary psychedelic experience, those institutionalized mystics we call psychotics." Leary suggests historical, psychological, and biological bases for his arguments. The book also includes a number of poems from Lao Tse that Leary believes were a result of psychedelic experiences.