does chewing tobacco cause lung cancer and smoker's cough Smokeless tobacco and cigarette smoking:

Smokeless tobacco and cigarette smoking: chemical mechanisms and cancer prevention Nature Reviews Cancer Think chewing tobacco is harmless? Think again. It doesn't just stain your teeth, it increases your risk of oral cancer by 6 to 7 times. Take a moment to think about the The Many Dangers of Tobacco Use UC Davis Biotechnology Program Every puff, every chew, every exposure it all adds up to a silent threat that often goes unnoticed until it's too late. Tobacco doesn't just harm the one who consumes it

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