The association between smoking cessation period and metabolic syndrome (MS) is currently unknown. We studied 6032 men aged >19 years who participated in the Korean National Health and Nutrition Examination Surveys between 2010 and 2012. The risk of MS according to the amount of smoking and duration of smoking cessation was examined, and adjusted for age, amount of alcohol consumed, physical activity, body mass index, income, and education levels. Compared with never-smokers, there was a significant increase in the risk of MS among current smokers >10 pack-years and former smokers with a history of pack-years >30. The odds ratio for MS increased with smoking amount in both current and former smokers. But the risk of MS in former smokers was no longer significant after 20 years of smoking cessation adjusted for past smoking amount. Thus, to prevent MS, current smokers should quit smoking early and former smokers should continue quitting.
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