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cigarette smoking, the inhalation of the gases and hydrocarbon vapors generated by slowly burning tobacco in cigarettes. The practice stems partly from the effect on the nervous system of the nicotine contained in the smoke.igarette smoking, the inhalation of the gases and hydrocarbon vapors generated by slowly burning tobacco in cigarettes. The practice stems partly from the effect on the nervous system of the nicotine contained in the smoke.
Medical Definition of Tobacco smoking. Tobacco smoking: The direct inhalation of tobacco smoke, the basis of major health hazards. Long known to cause cancer in humans, tobacco smoking is generally held to be the leading preventable cause of cancer in developed countries. Tobacco smoking was formally classified as a known human carcinogen by the US government in 2000.