Abstract
Army and Veterans Administration records were used to investigate the possible significance of influenza and mustard-gas poisoning in the etiology of lung cancer. Three groups of World War I Army veterans were traced for mortality from 1919 through 1955: 1,855 men who had pneumonia during the influenza pandemic, 2,718 men who were hospitalized for mustard-gas poisoning in 1918, and a control group of 2,578 soldiers who had wounds of the extremities. No relationship was seen between pneumonia in 1918 and subsequent cancer; there was, however, suggestive evidence that the incidence of lung cancer was slightly increased in men who had been subjected to mustard-gas poisoning in 1918.

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