four cancer-causing substances found in tobacco products. Smokeless and cigarette smoking: chemical mechanisms and cancer prevention Cigarettes contain thousands of chemicals—over
Cigarettes contain thousands of chemicalsover 7,000 have been identifiedmany of which are toxic, and at least 70 are known to cause cancer. When a cigarette burns, these chemicals are inhaled deep How does smoking cause cancer? Cancer Research UK Health effects of smoking tobacco Wikipedia Smoking and Breast Cancer Risk Breast Cancer Research Foundation
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