BSIP, LAURENT / SCIENCE PHOTO LIBRARY BSIP, LAURENT / SCIENCE PHOTO LIBRARY
Woman smoking a tobacco cigarette and holding a cup in her hands. Tobacco contains the addictive stimulant nicotine. Cigarettes also contain tar and carcinogens, which cause lung cancer, heart disease and bronchitis. Drinks such as tea and coffee contain caffeine, another stimulant, which may cause tremors, agitation and confusion if taken in large quantities.
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