chewing tobacco and cancer rates What Are the Main Risk Factors for Head & Neck Cancers? | Roswell Park Comprehensive Center Chewing Tobacco and Mortality of

If you think thats the stupidest thing youve ever heard, you can take it up with Sir Ronald Fisher, who actually made this argument with apparent sincerity in a 1957 letter to the British Medical Journal

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The participants were all aged 55 to 74, and had to have smoked for at least 30 "pack years." Pack years are calculated by multiplying the number of packs of cigarettes smoked per day by the number of years someone smoked