Which substance is not classified as a hallucinogen, psychedelic, or psychomimetic?

Marijuana, also known as cannabis, is not classified as a hallucinogen, psychedelic, or psychomimetic in the same way that the other substances listed are. Hallucinogens typically alter perception, mood, and cognitive processes by affecting serotonin receptors in the brain, leading to significant alterations in consciousness and sensory perception.

Psilocybin and LSD are classic examples of hallucinogens and psychedelics that produce vivid visual and auditory hallucinations and profound changes in thought processes. Ketamine, while primarily known as an anesthetic, also has dissociative effects and can produce a state of altered perception and consciousness at certain doses, which aligns it with the characteristics of psychomimetics.

Marijuana, on the other hand, primarily exerts its effects through the endocannabinoid system, primarily influencing mood, relaxation, and appetite rather than producing the intense perceptual changes typical of hallucinogens. It can have psychoactive effects, particularly in higher doses, but these do not typically include the pronounced alterations in sensory perception associated with drugs like LSD and psilocybin. This distinction is what sets marijuana apart from the other substances on the list.