Were psychedelics used in the past by Buddhists? I know it's discouraged for Buddhists to intoxicate their body, but were there any known cases of monks using psychedelic drugs intentionally in the past?
Buddhism is about having in-body experiences not out-of-body experiences. Psychedelics distort one's experience/perspective of reality and Buddhism is about experiencing reality for what it really is. Thus psychedelic drugs are the opposite of the dharma path and not used by monks or nuns.