Thirty "pack years" of smoking is defined as smoking ____ for 30 years.

Name: Thirty "pack years" of smoking is defined as smoking ____ for 30 years.
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"Pack years" is a measure of how much a person has smoked over time, calculated by multiplying the number of packs of cigarettes smoked per day by the number of years a person has smoked. One pack of cigarettes contains 20 cigarettes, so 30 pack years of smoking translates to smoking 20 cigarettes a day for 30 years.

Thirty "Pack Years" of Smoking Is Defined as Smoking ____