Lung cancer is the most common cause of death due to cancer in both men and women throughout the world. Statistics from the American Cancer Society estimated that about 228,000 new cases of lung cancer in the U.S. will be diagnosed and about 159,000 deaths due to lung cancer would occur in 2013 .
Lung cancer was not common prior to the 1930s but increased dramatically over the following decades as tobacco smoking increased. In many developing countries, the incidence of lung cancer is beginning to fall following public education about the dangers of cigarette smoking and the introduction of effective smoking-cessation programmes .
Cigarette smoking is an undisputed cause of lung cancer. Passive smoking, or the inhalation of tobacco smoke from other smokers sharing living or working quarters. Radon gas, a naturally-occurring gas that forms when uranium decays, is another known cause of lung cancer.
Asbestos is a compound that was widely used in the past as both thermal and acoustic insulation material.
Heredity, since all smokers do not eventually develop lung cancer, it is likely that other factors, such as individual genetic susceptibility, may play a role in the causation of lung cancer. Air pollution from vehicles, industry, and power plants, can raise the likelihood of developing lung cancer in exposed individuals. It has been estimated that up to 2,000 lung cancer deaths per year may be attributable to breathing polluted air, and many experts believe that prolonged exposure to highly polluted air can carry a risk for the development of lung cancer similar to that of passive smoking.
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