The common classifications for hallucinogens are psychedelics, dissociatives and deliriants. Amphetamines are a chemical class of stimulants, entactogens, hallucinogens, and other drugs. Substituted amphetamines are a chemical class of stimulants, entactogens, hallucinogens, and other drugs. The term is most commonly associated with hallucinogens, particularly psychedelics and entactogens. Examples include cocaine, methamphetamines, heroin, and hallucinogens. Other recreational drugs such as methamphetamine, cannabis, hallucinogens, or heroin, may be implicated. Pope's research focus is on substance abuse, especially anabolic steroids, marijuana, hallucinogens, and MDMA. This was found to be comparatively higher than hallucinogens (26%) and amphetamines (22%). Certain psychoactives, particularly hallucinogens, have been used for religious purposes since prehistoric times. Almost all hallucinogens contain nitrogen and are therefore classified as alkaloids. Attitudes towards hallucinogens other than cannabis have been slower to change. The chemicals involved may be irritants, hallucinogens, convulsants, nerve poisons or vasoconstrictors. She has extensive knowledge of a wide range of chemicals, drugs, hallucinogens, and poisons. Thus, like most hallucinogens, salvinorin A has low abuse potential. Abuse of hallucinogens can trigger delusional and other psychotic phenomena long after cessation of use.