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Pack years is a way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org lung Black Lives Black Lungs: How Big Tobacco used advertising to target communities of color Milwaukee Independent Doctor rejects black lungs donated by thirty year old chain smoker The American Lung Association has a page about what is in a cigarette. There are 600 ingredients in cigarettes, and over 7,000 chemicals are released when lit. Watch to learn what is in a cigarette.

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