try this
Posted By: pdqtrans on 2007-01-17
In Reply to: Does anybody know how they figure pack years? - april
Subject: try this
A pack year is a quantification of cigarette smoking. A pack year is equivalent to smoking a 20-cigarette pack a day for one year. A smoker who smokes 20 cigarettes a day for five years would then have a five pack year level of exposure.
If a person smokes 30 cigarettes a day for 40 years, would have a pack year of 60
1.5 x 40 = 60 pack years
A X B = pack years
A = packs per day = cigarettes/20
B = years of smoking
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