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pack year (pak yeer)

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 1 pack per day for 1 year, or 2 packs
per day for half a year, and so on.

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