If you needed another reason to quit smoking, there you have it. Medical researchers found a link between smoking and mouth cancer, developed after getting infected with human papillomavirus type 16 (HPV16). Even three cigarettes a day increase the risks of catching the virus by one-third, according to researchers at John Hopkins University.
Oral sex is the main mode that HPV16 gets transmitted. The virus is responsible for 80 percent of the cancers developed in the back of the throat. This type of cancer develops more often, as in the last 20 years the rate increased by 225 percent.