10 cigarettes a day for 20 years What is 20-year smoker's pack-year history? Association of childhood smoking and
Association of childhood smoking and adult mortality: prospective study of 120 000 Cuban adults ScienceDirect Deadly Math: 20 Cigarettes Equal 7 Hours Lost, Study Finds The Many Benefits of Quitting Smoking Parrish Healthcare The reduction in cigarette consumption is a remarkable example of how human behavior can be changed for the better on a global scale. Why did this succeed with cigarettes while so many Charted: The Decline of Cigarette Smoking in U.S. Young Adults Pack Years of Smoking Practicing Clinicians Exchange
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