How do you get oral cancer?

Several possibile. Oral sex, has become a major cause, due to the hpv virus. Hpv has been spreading oral cancer much more rapidly than in years past. Multiple sex partners has been shown to expand the incidence of probability exponentially. Heavy smoking, heavy drinking and an unhealthy lifestyle are also contributors.
Many ways. The most common way is being or having been a smoker of tobacco chewer. Although sometime many cases appear on the tongue on people who never smoked. These usually have metastasized from other sites.
Many ways. The known risk factors for oral cancer are tobacco use (whether cigarettes, cigars or smokeless tobacco), alcohol use, and infection with certain strains of human papilloma virus. Genetics may play a role in some people.
Many ways. The most common way is being or having been a smoker of tobacco chewer. Although sometime many cases appear on the tongue on people who never smoked. These usually have metastasized from other sites. The hpv has caused a great increase in oral cancer. The younger generation needs to be educated about the hpv and oral cancer. The vaccine hasn't been out there that long.