what is the substance in tobacco that causes cancer carcinogens, their biomarkers and tobacco-induced Chemicals in Tobacco Products and

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Smoking Cessation and the Risk of Oral Cancer

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The proportion of reported aggregate expenditure categories as well as the reported level of morbidity and mortality that are attributable to tobacco use were estimated using the AF which was calculated as follows: where AF ts denotes the attributable fraction by type of tobacco use t (smoked or smokeless tobacco use) and sex s (males or females), PES refers to the prevalence of ever smokers, PNS refers to the prevalence of never smokers, and RR is the all cause, all ages relative risk of morbidity and mortality due tobacco use