The effects of secondhand smoke on chronic obstructive pulmonary disease in nonsmoking Korean adults
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Background/Aims: Smoking is widely acknowledged as the single most importantrisk factor for chronic obstructive pulmonary disease (COPD). However, therisk of COPD in nonsmokers exposed to secondhand smoke remains controversial. In this study, we investigated the association of secondhand smoke exposurewith COPD prevalence in nonsmokers who reported never smoking. Methods: This study was based on data obtained from the Korean NationalHealth and Nutrition Examination Surveys (KNHANES) conducted from 2008 to2010. Using nationwide stratified random sampling, 8,596 participants aged ≥ 40years of age with available spirometry results were recruited. After selecting participantswho never smoked, the duration of exposure to secondhand smoke wasassessed based on the KNHANES questionnaire. Results: The prevalence of COPD was 6.67% in participants who never smoked. We divided the participants who had never smoked into those with or withoutexposure to secondhand smoke. The group exposed to secondhand smoke wasyounger with less history of asthma and tuberculosis, higher income, and highereducational status. Multivariate logistic regression analysis determined that secondhandsmoke did not increase the prevalence of COPD. Conclusions: There was no significant difference in the prevalence of COPD betweenparticipants who had never smoked with or without exposure to secondhandsmoke in our study. Thus, secondhand smoke may not be an important riskfactor for the development of COPD in patients who have never smoked.
Abstract
Background/Aims: Smoking is widely acknowledged as the single most importantrisk factor for chronic obstructive pulmonary disease (COPD). However, therisk of COPD in nonsmokers exposed to secondhand smoke remains controversial. In this study, we investigated the association of secondhand smoke exposurewith COPD prevalence in nonsmokers who reported never smoking. Methods: This study was based on data obtained from the Korean NationalHealth and Nutrition Examination Surveys (KNHANES) conducted from 2008 to2010. Using nationwide stratified random sampling, 8,596 participants aged ≥ 40years of age with available spirometry results were recruited. After selecting participantswho never smoked, the duration of exposure to secondhand smoke wasassessed based on the KNHANES questionnaire. Results: The prevalence of COPD was 6.67% in participants who never smoked. We divided the participants who had never smoked into those with or withoutexposure to secondhand smoke. The group exposed to secondhand smoke wasyounger with less history of asthma and tuberculosis, higher income, and highereducational status. Multivariate logistic regression analysis determined that secondhandsmoke did not increase the prevalence of COPD. Conclusions: There was no significant difference in the prevalence of COPD betweenparticipants who had never smoked with or without exposure to secondhandsmoke in our study. Thus, secondhand smoke may not be an important riskfactor for the development of COPD in patients who have never smoked.
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