Chewing tobacco and snuff are less dangerous than cigarettes but the smokeless products still raise the risk of oral cancer by 80 percent, the World Health Organisation's cancer agency said on Tuesday.
The review of 11 studies worldwide showed people who chewed tobacco and used snuff also had a 60 percent higher risk of esophagus and pancreatic cancer.
The researchers sought to quantify the risk of smokeless tobacco after a number of studies differed on just how dangerous the products were, said Paolo Boffetta, an epidemiologist at the WHO's International Agency for Research on Cancer.
"What we did was try to quantify the burden of smokeless cancer," he said. "This has never been attempted in such a systematic way before."
Not good idea for smokers to switch
The researchers, who published their findings in Lancet Oncology, did this by looking at population-wide studies and trials of both humans and animals.
They 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 United States, Sweden and India.
They also found that while snuff and chew were less dangerous than smoking because they were not linked to lung cancer, getting cigarette users to switch was not good public policy.
"If all smokers did this there would be a net benefit," Boffetta said. "The point is we don't know whether this would happen and there is no data to suggest these smokers would stop or switch."
Local study links snuff to bronchitis
This corresponds to a study in the British Medical Journal by Dr O.A. Ayo-Yusuf from the Oral and Dental Hospital, University of Pretoria. The study focused on the association of snuff use with chronic bronchitis (CB) among South African women.
The study investigated a nationally representative sample of 4 464 black South African women roughly 25 years old who participated in the 1998 South African Demographic and Health Survey.
The results of the study showed that snuff use, in the form predominantly used in South Africa, increases the risk of CB.
– (Reuters Health, BMJ)
Smokeless tobacco no safer