Most people who have smoked a joint or eaten a gummy know that cannabis can make the world feel a bit different. Music sounds better, time dilates, food becomes incredible and a conversation that started at crisps can end up at the nature of consciousness.
For most people, that is the simple joy of cannabis. But consume enough THC, the main psychoactive compound in the plant, and the experience can become much stranger. Colours shift, thoughts get stuck in a loop, conversations become hard to follow, your body can feel unfamiliar. The line between feeling a bit stoned and feeling properly out of your depth gets thin. Fast.
People who have had one of these heavier cannabis experiences often use the same language as people describing mushrooms or LSD. They talk about dissolving into the sofa or having a moment of unexpected emotional clarity. Which raises a question: can cannabis be classed as a psychedelic?
Cannabis is a cannabinoid. Drugs such as psilocybin, LSD and DMT are known as classic psychedelics. But a growing body of research suggests that, in the right circumstances, high doses of THC can produce experiences with more in common with a trip than many people might expect.
What is a psychedelic?
The word psychedelic gets used fairly freely. Coined by psychiatrist Humphry Osmond and writer Aldous Huxley to combine the Greek terms Psyche, meaning ‘mind/soul’ and Delos, meaning ‘to make visible’. Today it can mean anything colourful, trippy or vaguely connected to a lava lamp, but in science, it has a more specific meaning.
Classic psychedelics such as psilocybin, LSD and DMT primarily act on a serotonin receptor in the brain called 5-HT2A. That action plays a central role in the altered perceptions, changes in thought and sometimes profound emotional experiences associated with these drugs.
Cannabis works differently. THC mainly acts on the body’s endocannabinoid system, particularly CB1 receptors in the brain. Those receptors are involved in things such as memory, mood, appetite, pain and coordination.
That distinction is why cannabis is not generally classified alongside mushrooms or acid. It has a different chemistry, a different primary mechanism and a different place in most people’s lives. A person might smoke cannabis every evening for sleep, pain, recreation or relaxation. Most people are not taking psilocybin before locking into a new episode Bake Off.
But a drug’s mechanism does not always tell you exactly how it will feel. Alcohol, ketamine and MDMA are all very different substances that can alter consciousness in ways that overlap at the edges. Cannabis has long occupied an awkward space here. It is familiar enough to be thought of as mild, but potent enough to knock some people sideways.
When weed gets weird
The vast majority of cannabis experiences do not look much like a mushroom trip. A standard smoke with friends is unlikely to send anyone into a mystical encounter with the universe.
High doses are another matter, especially when cannabis is consumed orally. Edibles containing THC take longer to kick in, last much longer and are metabolised differently by the body. This is one reason people can underestimate them, eat more too soon and find themselves considerably higher than intended.
At those levels, cannabis can produce visual distortions, unusual bodily sensations, intense anxiety, paranoia and a warped sense of time. Some people describe a feeling of unity or emotional release. Others describe it as an experience they would happily never repeat.
A 2024 review in the Journal of Psychopharmacology examined the evidence from cannabis studies for these more psychedelic-like effects. Its authors concluded that high-THC consumption can produce perceptual changes and mystical-type experiences more usually linked with classic psychedelics.
They suggested that controlled cannabis studies may not have spotted these effects as often because they have tended to use doses and environments very different from those used in psychedelic therapy research.
Anyone who has used psychedelics will have heard about the need to consider “set and setting” – your mindset, your expectations and the place where you take the drug. It’s why the same dose of mushrooms can feel different at a noisy party, alone in an unfamiliar place or lying down comfortably at home with people you know and trust.
THC and psilocybin go head to head
A small new trial has tested the importance of set and setting on high doses of cannabis to understand if it can be compared to psychedelics. Researchers at Johns Hopkins University compared oral THC with psilocybin in the sort of carefully prepared setting usually used for psychedelic therapy trials.
The pilot study, published in the journal Psychopharmacology in August 2026, involved four healthy adults. Each took placebo, 25 mg psilocybin and 25 mg THC on separate occasions. Two participants also received 50 mg THC.
The participants were prepared for the sessions in advance, spent the day with trained facilitators and were encouraged to focus inward, just as they would be in a psychedelic therapy study. They were told they could receive one of several psychoactive drugs, rather than being told exactly what they had taken.
At 25 mg, both forms of THC produced scores on a measure of mystical experience that were broadly comparable with 25 mg of psilocybin. Two participants who received synthetic THC, known as dronabinol, thought the experience was more similar to a classic psychedelic or a dissociative drug than cannabis.
While the results point towards cannabis being at least psychedelic-like in a clinical setting, the authors pointed out a few caveats. The other two participants, who received a cannabis distillate, were more likely to recognise that they had taken a cannabinoid, and a 50 mg dose did not simply make the experience more psychedelic. The effects changed depending on the dose, the formulation and the person taking it.
The study also recorded nausea, anxiety, physical discomfort and, in one case, paranoia. One participant experienced effects from a 50 mg THC distillate dose that lasted into the next day. Most importantly, there were only four participants. The researchers were keen to point out that the data set isn’t big enough to draw firm conclusions, and, as always, that more research is needed.
So, is cannabis a psychedelic?
Cannabis is still best understood as a psychoactive cannabinoid. Its main compound acts differently from classic psychedelics and, for most people most of the time, the effects are nothing like taking mushrooms or LSD.
But the old idea that cannabis and psychedelics are completely separate worlds is looking less certain. High-dose THC can, at least for some people and under particular conditions, produce experiences that overlap with a psychedelic state. Something anyone who’s eaten too much weed brownie will tell you.
The bigger question is whether those experiences could one day have a place in therapy. The 2024 review called for more research, while the new pilot study shows why that research needs to be expanded under clinical settings. Dose, preparation, expectations and the setting all appear to influence how much cannabis can work like a psychedelic when used in therapy.
For now, the answer is somewhere between “not really” and “sometimes, very much so”. Cannabis is not psilocybin in disguise. But in the right (or wrong) circumstances, it can take you somewhere you didn’t plan to go.
