Pack year means
(B) 20 cigarettes per day for 1 year# A pack-year is a quantification of cigarette smoking.> 1 pack-year is equal to smoking 20 cigarettes (1 pack) 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) * (years as a smoker).
10 cigarettes per day for 1 year
20 cigarettes per day for 1 year
40 cigarettes per day for 1 year
50 cigarettes per day for 1 year
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