how many cigarettes are smoked a year Pack-years is way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org/lung ๐๐ฒ๐โ๐ ๐ฐ๐ผ๐๐ป๐ ๐ฑ๐ผ๐๐ป ๐๐ต๐ฒ ๐๐ผ๐ฝ
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