Respiratory Tract and Lung cancer.
Oral cancer is uncommon, except among tobacco users and heavy drinkers of alcohol.
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.