Changes in Smoking Habits and Behaviors Following the Introduction and Spread of Heated Tobacco Products in Japan and Its Effect on FEV<sub>1</sub> Decline: A Longitudinal Cohort Study.

J Epidemiol · 2022 · PMC8918621 · PMID 34657910

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a decreasing trendno p-value reported

For combustible cigarette-only smokers and HTP-only users, the number of combustible cigarettes smoked per day at baseline and the number of tobacco products used per day at follow-up were comparable with a decreasing trend.

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