Abstract Hallucinogens constitute a unique class of substances that cause changes in the user's thoughts, perceptions, and mood through various mechanisms of action. Although the serotonergic hallucinogens such as lysergic acid diethylamide, psilocybin, and N,N‐ dimethyltryptamine have been termed the classical hallucinogens , many hallucinogens elicit their actions through other mechanisms...