Impact of weight change after quitting cigarettes on all-cause and cause-specific mortality in middle-aged male smokers: national health screening cohort study
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1
Seoul National University, Korea, Republic of
2
Seoul National University, Department of Biomedical Sciences, Korea, Republic of
3
Seoul National University Hospital, Department of Family Medicine, Korea, Republic of
4
Seoul National University Bundang Hospital, Department of Family Medicine, Korea, Republic of
5
Seoul National University, College of Medicine, Korea, Republic of
Publication date: 2018-03-01
Tob. Induc. Dis. 2018;16(Suppl 1):A342
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ABSTRACT
Background:
We aimed to investigate the
association between weight change after smoking cessation and the risk of
all-cause and cause-specific mortality among middle-aged male smokers.
Methods:
We conducted a
prospective cohort study using the National Health Insurance Service National
Health Screening Cohort (NHIS-HealS) database. Male Participants (n=102,403)
without critical conditions aged between 40 and 79 at baseline who underwent
biennial health examination were included in this study. Participants were
categorized into continued smokers, recent quitters (within 4 years), long-term
quitters (more than 4 years), and never-smokers based on the self-reported
smoking status. Weight change was determined by the change of Body Mass Index
(BMI) between the first (2002-2003) and second (2004-2005) health examination
records. We followed patients from January 1, 2006 to December, 31, 2013. To
assess the risk of all-cause, cancer, cardiovascular disease (CVD) mortality,
and non-cancer, non-CVD mortality according to smoking cessation and weight
change, we computed Hazard Ratio (HR) and 95% Confidence Interval
(95% CI)
using Cox proportional hazard models.
Results:
Severity of
weight gain was more prevalent among recent quitters compared to long-term
quitters. After adjusting for covariates and weight change, both recent
quitters (HR:0.74; 95% CI: 0.63-0.87) and long-term quitters (HR:0.53; 95%
CI:0.45-0.61) had decreased risk of all-cause mortality compared to continued
smokers. Similarly, both recent and long-term quitters had decreased risk of
cancer, CVD, non-cancer, and non-CVD death regardless of weight change
following smoking cessation. Compared to continued smokers, non-smokers also
had a lower risk of overall and cause-specific death.
Conclusions:
Post-cessation weight change
did not modify the protective association of smoking cessation with reduced
risk of all-cause and cause-specific death. From a public health perspective,
smoking cessation program may contribute to reducing risk of death in
middle-aged male smokers despite the concern on weight change after quitting
smoking.