Chewing tobacco and snuff may be less dangerous than cigarettes, but the smokeless products still raise the risk of oral cancer by 80 percent.
A review of 11 studies also showed that people who chewed tobacco and used snuff had a 60 percent higher risk of esophagus and pancreatic cancer.
Frequency of use of smokeless tobacco products varies greatly both across and within countries, depending on sex, age, ethnic origin and economic background. Rates of use are highest in the United States, Sweden and India.