A 55-year-old patient has been smoking a pack and a half of cigarettes (30 cigarettes) per day for 30 years. What is the patient's smoking history?
a. 30 pack-years
b. 35 pack-years
c. 40 pack-years
d. 45 pack-years
ANS: D
If a patient describes his or her smoking in terms of the number of cigarettes, or fractions of a pack, the calculation is as follows: there are 20 cigarettes per pack. If a patient states he or she has smoked a pack and a half of cigarettes per day for 30 years, then the smoking history is cal-culated as follows: 30 cigarettes/20 cigarettes-per-pack = 1.5 packs ? 30 years = 45 pack-year smoking history.
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