Drugs which invite misuse fall into the following groups:

• depressants and tranquillizers, such as alcohol, barbiturates, chlormethiazole, and benzodiazepines

• stimulants, such as cocaine, amphetamines, caffeine, and khat

• hallucinogens (psychedelics and psychotomimetics), such as LSD, mescaline, phencyclidine, psilocybin, and psilocin (magic mushrooms).

Other drugs include nicotine, cannabis, volatile inhalants, and various so called 'designer drugs' such as ketamine and GHB. Many drug misusers take a mixture of drugs, the choice depending on availability, price, and fashion as well as pharmacology.

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