Last Updated
：2025/12/04
pack-year
（ plural ）
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(medicine, smoking) A unit for measuring the number of cigarettes a person has smoked previously; it is calculated by multiplying the average number of packs of cigarettes the person smokes per day by the number of years the person has smoked.
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pack-year
The patient's lung cancer risk was partly attributed to his 40 pack-year smoking history.
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The patient's lung cancer risk was partly attributed to his 40 pack-year smoking history.
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