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Yong Liu,1 Roy A Pleasants,2 Janet B Croft,1 Anne G Wheaton,1 Khosrow Heidari,3 Ann M Malarcher,4 Jill A Ohar,5 Monica Kraft,6 David M Mannino,7 Charlie Strange8 1Division of Population Health, Centers for Disease Control and Prevention, Atlanta, GA, 2Division of Pulmonary, Allergy, and Critical Care Medicine, Duke University School of Medicine, Durham, NC, 3Chronic Disease Epidemiology Office, Department of Health and Environmental Control, South Carolina, SC, 4Office of Smoking and Health, Centers for Disease Control and Prevention, Atlanta, GA, 5Section on Pulmonary, Critical Care, Allergy and Immunologic Disease, Wake Forest University, Winston Salem, NC, 6Department of Medicine, University of Arizona, Phoenix, AZ, 7Division of Pulmonary, Critical Care, and Sleep Medicine, Pulmonary Epidemiology Research Laboratory, University of Kentucky, Lexington, KY, 8Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, Medical University of South Carolina, Charleston, SC, USA Background: The purpose of this study was to assess the relationship of smoking duration with respiratory symptoms and history of chronic obstructive pulmonary disease (COPD) in the South Carolina Behavioral Risk Factor Surveillance System survey in 2012.Methods: Data from 4,135 adults aged ≥45 years with a smoking history were analyzed using multivariable logistic regression that accounted for sex, age, race/ethnicity, education, and current smoking status, as well as the complex sampling design.Results: The distribution of smoking duration ranged from 19.2% (1–9 years) to 36.2% (≥30 years). Among 1,454 respondents who had smoked for ≥30 years, 58.3% were current smokers, 25.0% had frequent productive cough, 11.2% had frequent shortness of breath, 16.7% strongly agreed that shortness of breath affected physical activity, and 25.6% had been diagnosed with COPD. Prevalence of COPD and each respiratory symptom was lower among former smokers who quit ≥10 years earlier compared with current smokers. Smoking duration had a linear relationship with COPD (P |
