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marijuana
marijuana or marihuana, drug obtained from the flowering tops, stems, and leaves of the hemp plant, Cannabis sativa (see hemp ) or C. indica; the latter species can withstand colder climates. It is one of the most commonly used drugs in the world, following only caffeine , nicotine , and...
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hashish
hashish , resin extracted from the flower clusters and top leaves of the hemp plant, Cannabis sativa, and C. indica. Hashish, called charas in India, is the most potent grade of cannabis and is obtained from cultivated plants grown in hot, moist climates. Marijuana , a cheaper and less potent s...
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cannabis
cannabis (kan-ă-bis) n. a drug prepared from the Indian hemp plant (Cannabis sativa), also known as pot, marijuana, hashish, and bhang. It produces euphoria and hallucinations and has little therapeutic value; its nonmedical use is illegal. See also dependence....
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Rastafarianism
Rastafarianism a religious-cultural movement that began (1930s) in Jamaica. Rastafarians believe that Haile Selassie , also named Ras Tafari, the last emperor of Ethiopia (d. 1975), is the Messiah. They tend to reject European culture and ideas and are particularly noted for their use of marijuana...
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hemp
hemp common name for a tall annual herb ( Cannabis sativa ) of the family Cannabinaceae, native to Asia but now widespread because of its formerly large-scale cultivation for the bast fiber (also called hemp) and for the drugs it yields. Known and cultivated in ancient China, the plant was introduc...
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herbicide
herbicide , chemical compound that kills plants or inhibits their normal growth. A herbicide in a particular formulation and application can be described as selective or nonselective. In agriculture, selective herbicides are often used instead of tillage, or in combination with tillage and other agr...
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impotence
impotence , inhibited sexual excitement in a man during sexual activity that, despite an unaffected desire for sex, results in inability to attain or maintain a penile erection. Known medically as male erectile dysfunction, it affects younger and older men alike. Impotence can result from psychologi...
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LSD
LSD or lysergic acid diethylamide , alkaloid synthesized from lysergic acid, which is found in the fungus ergot ( Claviceps purpurea ). It is a hallucinogenic drug that intensifies sense perceptions and produces hallucinations, mood changes, and changes in the sense of time. It also can caus...
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hallucinogenic drug
hallucinogenic drug , any of a group of substances that alter consciousness; also called psychotomimetic (i.e., mimicking psychosis ), mind-expanding, or psychedelic drug. The group includes mescaline, or peyote , which comes from the cactus Lophophora williamsii ; psilocin and psilocybin, from t...
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Dopamine
Dopamine
Dopamine belongs to a family of biological compounds called catecholamines (see Figure 1). Dopamine is synthesized from the compound L-dihydroxyphenylalanine (L-dopa) via the enzyme dopa decarboxylase. In noradrenergic neurons and in the adrenal glands, dopamine is the precursor for the ...
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