When I was at Occidental College, all humanities majors had to take a course in anthropology which was taught by a young professor who was enamored with
The Teachings of Don Juan: A Yaqui Way of Knowledge by Carlos Castaneda (Berkeley, Calif.: University of California Press, 1968), which sang praises of peyote and its wonderful effects. The professor even devoted a whole unit to this book and assigned us to write an essay as to how psychotropic drugs such as peyote could improve society.
Carlos Castaneda was later exposed as a fraud, and this and other books that he wrote are essentially fiction.