title: [Follow-up study of lung function changes for 10 years in healthy elder of ex-smokers].
abstract: OBJECTIVE
  To observe changes of lung function for 10 years in healthy elderly ex-smokers who have quitted smoking for more than 10 years.
  
  
  METHODS
  51 healthy elderly ex-smokers were selected and routine lung function tests were performed, 12 subjects, who have never smoked and all other criteria were similar, were chosen as controls. Their routine lung function tests have also been followed up for 10 years.
  
  
  RESULTS
  The decrease of VC, FVC, FEV1 and PEF of ex-smokers were significantly lower than non-smokers, the increase of RV and RV/TLC were significantly higher than non-smokers. FEV1/FVC, MVV, MMEF, FRC and TLC were also different, however, the difference has not reached statistically significant.
  
  
  CONCLUSIONS
  The influence of smoking could be prolonged, even the subject has stopped smoking for years, so we suggested to stop smoking the early the better.
authors.affiliation: Dept. of Respiratory Diseases, General Hospital of PLA, Beijing 100853.
authors.forename: C
authors.initials: C
authors.lastname: Liu
authors.forename: D
authors.initials: D
authors.lastname: Wang
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D012129:Respiratory Function Tests; D012907:Smoking / Q000009:adverse effects; D016540:Smoking Cessation