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To calculate pack years, use the formula: Pack Years = (Cigarettes per Day 20) Years Smoked

Over the past decade, the number of Americans who smoke tobacco has declined thanks in part to smoking bans in many US public spaces, restaurants, and bars

Dinur-Klein, L

Editors note: The headline and text of this story were updated on April 27, 2026, to accurately reflect that the policy would ban the sale of tobacco products, not smoking itself

As a result of these uncertainties we performed a sensitivity analysis reducing F AA , F TA and RRs for consuming ten units alcohol per week or ten cigarettes per week by 50%