NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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How is the pack year smoking history calculated?

  1. Cigarette packs/week x years smoked

  2. Cigarettes/day x years smoked

  3. Cigarette packs/day x years smoked

  4. Cigarettes/week x years smoked

The correct answer is: Cigarette packs/day x years smoked

The pack year smoking history is calculated by multiplying the number of cigarette packs smoked per day by the number of years a person has smoked. This is because a pack of cigarettes usually contains 20 cigarettes, so the number of packs smoked per day is a more accurate measure of overall smoking history compared to just the number of cigarettes smoked per day. Options A, B, and D all have incorrect calculations because they do not take into account the number of cigarettes in a pack and may lead to an overestimation or underestimation of a person's smoking history.

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