A drug is a chemical substance that acts on the brain and nervous system, changing a person’s mood, emotion or state of consciousness. Drugs are often classified by the effect they have.
Stimulants, such as cocaine, make people feel full of energy. Depressants (or sedatives), such as heroin, make people feel relaxed. Hallucinogens, such as LSD, make people see, feel or hear things that are not real. Drug or substance misuse is when a person regularly takes one or more drugs to change their mood, emotion or state of consciousness.
Inhaling evidence about tobacco and psychosis
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Ian Hamilton explores a recent Finnish study of adolescent tobacco smoking and the risk of psychosis, which found that young people aged 15-16 who smoked more than 10 cigarettes a day were three times more likely to have psychosis by the time they reached age 30.
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