title: [Effects of smoking on lung function in populations of Beijing and Guangzhou].
abstract: OBJECTIVE
  To analyse the relationship between cigarette smoking and lung function in populations of Beijing and Guangzhou.
  
  
  METHODS
  Complete lung function and smoking habit data were recruited from 7983 men and women aged 35-59 in or around Beijing and Guangzhou. Comparisons were made between smokers and never smokers.
  
  
  RESULTS
  The mean values of FEV1/H2, FEF/H2 and FEV1/FVC are all lower in smokers than in never smokers for male smokers, the observed mean value of FEV1/H2 for each age group in smaller than the respective predicted value, and its descending trend with aging is more obvious than the predicted value when re-examination after 2-4 years; furthermore, smokers had higher prevalences of respiratory symptom and COPD.
  
  
  CONCLUSIONS
  Cigarette smoking is harmful to lung function.
authors.affiliation: Guangdong Cardiovascular Institute.
authors.forename: X
authors.initials: X
authors.lastname: Rao
authors.forename: R
authors.initials: R
authors.lastname: Cai
authors.forename: Z
authors.initials: Z
authors.lastname: Huang
mesh_terms: D000328:Adult; D002681:China / Q000453:epidemiology; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008168:Lung / Q000502:physiology*; D008173:Lung Diseases, Obstructive / Q000453:epidemiology / Q000209:etiology; D008297:Male; D008875:Middle Aged; D012129:Respiratory Function Tests; D012907:Smoking / Q000009:adverse effects*