Here's just a list of books every "psychedelic substance" enthusiast should read, even those who are interested in psychedelics:
"Your Brain Is God" by Timothy Leary
"The Cosmic Serpent" by Jeremy Narby
"Food of the Gods" by Terence McKenna
"Remember, Be Here Now" by Ram Dass
"Marijuana Medicine" by Christian Ratsch
"Flesh of the Gods" edited by Peter Furst
"DMT: The Spirit Molecule" by Dr. Rick Strassman
"The Sacred Mushroom & The Cross" by John Marco Allegro
"The Doors of Perception and Heaven and Hell" by Aldous Huxley
"Plants of the Gods" by Richard Evans Schultes & Albert Hofmann
"The Dead Sea Scrolls and the Christian Myth" by John Marco Allegro
"Astrotheology & Shamanism Christianity's Pagan Roots" by by Jan Irvin & Andrew Rutajit
"The Holy Mushroom: Evidence of Mushrooms in Judeo-Christianity" by J.R. Irvin, Jack Herer, Jan Irvin
"Breaking Open the Head: A Psychedelic Journey into the Heart of Contemporary Shamanism" by Daniel Pinchbeck
"The Psychedelic Experience: A Manual Based on the Tibetan Book of the Dead (Citadel Underground)" by Karma-Glin-PaBardo
"Inner Paths to Outer Space: Journeys to Alien Worlds through Psychedelics and Other Spiritual Technologies" by Dr. Rick Strassman
"The Emperor Wears No Clothes: The Authoritative Historical Record of Cannabis and the Conspiracy Against Marijuana" by Jack Herer
"The Archaic Revival: Speculations on Psychedelic Mushrooms, the Amazon, Virtual Reality, UFOs, Evolution, Shamanism, the Rebirth of the Goddess, and the End of History" by Satty
Hope these keep you busy
