5 cigarettes a day pack years are unit of measurement used to estimate the amount a person has smoked over their lifetime. It is calculated by multiplying the number of packs of smoked per Tobacco, Lung Cancer & Quitting
Tobacco, Lung Cancer & Quitting Smoking FAQ cCARE Smoking history calculator Ready to Screen Smoking duration alone provides stronger risk estimates of chronic obstructive pulmonary disease than pack years Thorax Pack Year Calculator
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