why chewing tobacco causes cancer How does smoking cause cancer? How Does Smoking and Chewing

[12] The choice of tree ashes and additional plant ingredients varies among different groups and is often specific to individual tribes

Availability of data and materials The datasets analyzed during the current study are available in the IPUMS repository at Abbreviations NHIS: National health interview survey HR: Hazard ratio CI: Confidence interval IPUMS: Integrated public use microdata series NDI: National Death Index ICD: International classification of diseases and related health problems BMI: Body mass index CPS: Cancer prevention study TUS-CPS: Tobacco use supplement to the current population survey References Rostron BL, Corey CG, Gindi RM

Cigarette smoke contains chemicals that paralyse the cilia, the tiny hair-like structures lining your airways whose job is to sweep out mucus, dust, and debris

Gingival melanosis, or darkening of the gingiva, is significantly higher in smokers who smoked more than 10 cigarettes a day