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Pack year is calculated by the number of packs of cigarettes smoked per day (20 cigarettes in one pack) times the number of years of smoking. Pack years is a way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org lung Lung cancer screening age and guidelines HealthPartners Blog How to Calculate Pack Years: A Step by Step Guide (2026) cigarette pack year calculation cigarette pack years calculation Lung Cancer FAQs smoking 3 cigarettes a day Cardiologists Lack Resources to Help Hospitalized Patients Quit Smoking
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