The world of hallucinogens is complex and diverse, with many different substances and classifications. While the term “psychedelic” is often used interchangeably with “hallucinogen,” it’s essential to recognize that not all hallucinogens are psychedelics, and not all psychedelics are hallucinogens. The classical psychedelics, which include DMT, psilocybin, mescaline, and LSD, are characterized by their action on serotonin receptors, specifically 5-HT2A.