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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.
Cigarettes, the most common form of tobacco used, cause 90% of all lung cancer deaths, according to the American Lung Association. In addition, about 80% of people with oral cancers use tobacco. Cigarettes contain more than 60 cancer-causing agents. Cigars and pipes are often perceived as the less harmful way to smoke tobacco. However, even when not inhaling, cigar and pipe smokers are at increased risk for cancer of the oral cavity and lungs.