Chewing tobacco and snuff are less dangerous than cigarettes but the smokeless products still raise the risk of oral cancer by 80%, the World Health Organisation's cancer agency said. The review of 11 studies worldwide showed people who chewed tobacco and used snuff also had a 60% higher risk of oesophagus and pancreatic cancer. The researchers who published their findings in Lancet Oncology, found frequency of use varies greatly both across and within countries, depending on sex, age, ethnic origin and economic background, and were highest in the US, Sweden and India.