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.
Are e-cigarettes more addictive than tobacco?

Tuba Saygin Avsar reviews a study on the perceived addiction of e-cigarettes, which used data from the International Tobacco Control Smoking and Vaping England Survey, to suggest that most UK vapers consider e-cigarettes less addictive than tobacco.
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