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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.
a unit of quantity for cigarettes used in medicine to measure a patient's smoking history. One pack year is the equivalent of smoking one 20-cigarette pack per day for one year, that is, a total of 7300 cigarettes.