What question did this study set out to answer?

The study aims to evaluate the relationship between smoking habits and the decline of FEV1 over a 12-year period in Japanese males.

Effects of smoking habits on annual change in FEV 1 : A 12-year follow-up study

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Longitudinal study investigates how smoking habits impact FEV1 decline in Japanese males, suggesting intervention benefits.

The study aims to evaluate the relationship between smoking habits and the decline of FEV1 over a 12-year period in Japanese males.
Included 913 male subjects aged 30-76 years at baseline.
Conducted lung function tests in 1994, 1999, and 2006.
Categorized subjects into persistent never smokers, early quitters, late quitters, and persistent smokers.
Defined airflow obstruction using FEV1/FVC criteria.
Mean annual FEV1 decline was highest in persistent smokers at -44.8 ml/year.
Early quitters had a decline of -37.9 ml/year, while persistent never smokers had -35.0 ml/year.
Persistent smokers with airflow obstruction had a significant annual decline of -60.3 ml/year.
The findings show that early cessation of smoking can reduce the FEV1 decline.

Omori et al. (2011) studied this question.

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