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Lung cancer occurs when the cells within the lung tissue are altered at a genetic level to mutate and multiply at an aggressive rate. The results of many studies on the effects of tobacco have shown that cigarette smoke carries numerous chemicals, called âmutagensâ, that cause lung tissue cells to mutate. Substances such as carbon monoxide, hydrogen peroxide and benzopyrene contained in cigarette smoke affect how cells change and grow.
1 Cancer. 2  All tobacco smoke contains chemicals that can cause cancer, and cigar smoke is no exception. 3  Regular cigar smoking increases the risk of several types of cancers, including cancers of the mouth, lip, tongue, throat, esophagus, larynx and lung. 4  Lung and heart disease.