2 packs of cigarettes a day for 20 years What is 20-year smoker's pack-year history? Both Duration and Pack-Years of
Both Duration and Pack Years of Tobacco Smoking Should Be Used for Clinical Practice and Research PMC This equates to nearly 7 hours of life lost when smoking an average pack of 20 cigarettes." Those aged 50 80 years with a history of 20+ pack years of smoking are now considered high risk for lung cancer, as per the updated USPSTF guidelines. This broadened criterion has increased the Charted: The Decline of Cigarette Smoking in U.S. Young Adults
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