Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A pack year is a quantification of cigarette smoking.A way to measure the amount a person has smoked over a long period of time. It is calculated by multiplying the number of packs of cigarettes smoked per day by the number of years the person has smoked. For example, 1 pack year is equal to smoking 20 cigarettes per day for 1 year, or 40 cigarettes per day for half a year, and so on.Number of Pack Years = (Packs smoked per day) x (years as a smoker)
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