Entheogens as Psychedelics
"Another peculiar effect of these drugs is a dramatic change in perception: it appears to the person as if the eyes (the 'doors of perception') have been cleansed and the person could see the world as new in all respects — 'as Adam may have seen it on the day of creation' as Aldous Huxley (1954, p. 17) pointed out in his popular and influential book. This new reality is perceived and interpreted by some individuals as manifestation of the true nature of their mind; hence, the term 'psychedelic' was suggested by Osmond (1957). This interpretation has been embraced not only by professional therapists but also by some segments of the public, and gave rise to the 'Summer of Love' in San Francisco in 1967 with free distribution of LSD. This perception resulted in the formation of numerous cults, communes, and drug-oriented religious groups (Freedman 1968), permeated the lyrics and style of popular music (acid rock), and was viewed by some as one of the contributing sources of the occasional resurgence of popularity of illegal drug use (Cohen 1966, Szára 1968)."
Szára, Stephen, "Are Hallucinogens Psychoheuristic," National Institute on Drug Abuse Research Monograph Series (Rockville, MD: U.S. Department of Health and Human Services, Public Health Service, National Institutes of Health, 1994) NIDA Research Monograph 146, p. 36.