Cancer of the lung is most prevalent in males in Western countries and is also said to be increasing in India. It is known to be associated with smoking cigarettes. It is generally accepted that there is a causal connection between cigarette smoking and lung cancer. Epidemiological studies have shown that there is a clear relationship between the number of cigarette smoked and the incidence of lung cancer. Giving up smoking decreases the susceptibility to lung cancer, in proportion to the number of years that smoking has been given up.
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