smoking cigarettes for a year Pack-years is way to measure a smoker's exposure to tobacco. Higher exposure means higher risk lung cancer. beaumont.org/lung How many cigarettes you're indirectly
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![PDF] Quantification of Nicotine and Cotinine in Plasma, Saliva, and Urine by HPLC Method in Chewing Tobacco Users](https://figures.semanticscholar.org/90bf555bb6dc40da217fede2b3ba91b58f46ee1b/4-Table1-1.png)




















