tobacco smoke contains more than 70 carcinogens over 7,000 chemicals. At least of them are known to cause cancer. When you breathe in secondhand smoke, you are processing those same 70 carcinogens—including arsenic, formaldehyde, and Lung Carcinogenesis by Tobacco Smoke
Lung Carcinogenesis by Tobacco Smoke PMC How does smoking cause cancer? Cancer Research UK Smokeless tobacco and cigarette smoking: chemical mechanisms and cancer prevention Nature Reviews Cancer Tobacco use causes many types of cancer CDC Online Newsroom CDC
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