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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 How is it even possible to smoke multiple packs of cigarettes a day? : r AskReddit Cigarette packs are being stripped of advertising around the world. But not in the US. Vox Have you ever wondered what smoking actually does to your lungs? A healthy lung, like those from a non smoker, is pink, spongy, and full of air sacs that let oxygen pass into Calculating Pack Years: How to measure how much you smoke Roswell Park Comprehensive Cancer Center Buffalo, NY

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