Is cannabis a psychedelic? High-dose THC can sometimes produce psychedelic-like experiences, but its chemistry and typical effects differ

Cannabis is generally classified as a psychoactive cannabinoid rather than a classic psychedelic because THC primarily acts on CB1 receptors, while psilocybin, LSD and DMT primarily affect the serotonin 5-HT2A receptor. However, high doses of THC, especially in oral forms and carefully prepared settings, can produce perceptual changes, altered time, unusual bodily sensations, emotional release, mystical-type experiences, anxiety and paranoia that overlap with psychedelic states. A 2024 review identified these effects, and a small Johns Hopkins pilot study compared 25 mg THC with 25 mg psilocybin in four adults receiving psychedelic-therapy-style preparation. Some THC experiences produced broadly comparable mystical-experience scores, although effects varied by dose, formulation and participant. Nausea, discomfort, anxiety and prolonged effects were also reported. The evidence is preliminary, so cannabis is not psilocybin in disguise, but high-dose THC may be psychedelic-like for some people under particular conditions.