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Respiratory Tract and Lung cancer
Cancerous growths in the mouth make up one in twenty of all cases of human cancers. Oral cancer is uncommon, except among tobacco users and heavy drinkers of alcohol. Three out of five cases of oral cancers are due to alcohol or tobacco (cigarettes, pipes, cigars and smokeless tobacco, especially snuff. The risk soars for people who smoke and drink. Two packs a day and four drinks a day, for example, means 35 times greater risk. The human papilloma virus is also suspect. See cancer and parasites for more information. Malignant growths on the lips are a frequent finding in areas of the world where strong sunlight is usual. The tongue is another site of cancer, often starting as an innocuous-looking area of whitening of the noramlly pink surface. A frequent cause of tongue and mouth cancer is tobacco smoking, especially in pipes and cigars, .
Lung Cancer has been on the increase since the turn of the century. Recently, however, there has been a decline in the number of men with lung cancer but a large increase in the number of women with lung cancer.
