Cancer Causes & Control

, Volume 19, Issue 2, pp 207–219

The change in excess risk of lung cancer attributable to smoking following smoking cessation: an examination of different analytic approaches using CPS-I data

  • James D. Knoke
  • David M. Burns
  • Michael J. Thun
Original Paper

Abstract

Background

Lung cancer risk is modified by smoking cessation. However, the inclusion in the group of former smokers of those who quit after developing symptoms or being diagnosed with lung cancer distorts the apparent risk in the first several years following cessation. This bias is termed the quitting ill effect.

Methods

Lung cancer mortality data from the American Cancer Society’s CPS-I were used to calculate the excess mortality among white male former smokers compared to the predicted risk had those individuals continued to smoke. Alternate approaches to minimizing the quitting ill bias were investigated. Goodness-of-fit of the models was assessed graphically and formally.

Results

Poisson models were built for the absolute lung cancer risk for never smokers and the excess risk, over never smokers, for continuing smokers. The decrease in excess risk in former smokers was modeled by a negative exponential function. The models for the three smoker subgroups (continuing, never, and former), all fit the data well. Assuming that the fraction of excess risk remaining for former smokers does not decline for the first two years following cessation and that the quitting ill effect does not influence those who are five or more years post-cessation allowed a reasonable estimation of the change in risk of lung cancer with increasing duration of abstinence.

Conclusions

The reduction in the excess risk of lung cancer in former smokers can be estimated, and the quitting ill effect minimized, by the inclusion of a lag between cessation and onset of reduction in risk.

Keywords

Lung cancer Tobacco Risk factor Methodological studies 

References

  1. 1.
    Ebbert JO, Yang P, Vachon CM, Vierkant RA, Cerhan JR, Folsom AR et al (2003) Lung cancer risk reduction after smoking cessation: observations from a prospective cohort of women. J Clin Oncol 21(5):921–926PubMedCrossRefGoogle Scholar
  2. 2.
    Peto R, Darby S, Deo H, Silcocks P, Whitley E, Doll R (2000) Smoking, smoking cessation, and lung cancer in the UK since 1950: combination of national statistics with two case–control studies. BMJ 321(7257):323–329PubMedCrossRefGoogle Scholar
  3. 3.
    Taylor DH Jr, Hasselblad V, Henley SJ, Thun MJ, Sloan FA (2002) Benefits of smoking cessation for longevity. Am J Public Health 92(6):990–996PubMedGoogle Scholar
  4. 4.
    Lubin JH, Blot WJ, Berrino F, Flamant R, Gillis CR, Kunze M et al (1984) Modifying risk of developing lung cancer by changing habits of cigarette smoking. Br Med J (Clin Res Ed) 288(6435):1953–1956Google Scholar
  5. 5.
    Garfinkel L, Stellman SD (1988) Smoking and lung cancer in women: findings in a prospective study. Cancer Res 48(23):6951–6955PubMedGoogle Scholar
  6. 6.
    Halpern MT, Gillespie BW, Warner KE (1993) Patterns of absolute risk of lung cancer mortality in former smokers. J Natl Cancer Inst 85(6):457–464PubMedCrossRefGoogle Scholar
  7. 7.
    Thun MJ, Myers DG, Day-Lally C, Namboodiri MM, Calle EE, Flanders WD et al (1997) Age and the exposure-response relationships between cigarette smoking and premature death in Cancer Prevention Study II. In: Changes in cigarette-related disease risks and their implication for prevention and control: smoking and tobacco control monograph no. 8, U.S. Department of Health and Human Services, National Institutes of Health, National Cancer Institute. NIH Publication No. 97-4213Google Scholar
  8. 8.
    Garfinkel L (1985) Selection, follow-up, and analysis in the American Cancer Society prospective studies. Natl Cancer Inst Monogr 67:49–52PubMedGoogle Scholar
  9. 9.
    Breslow NE, Day NE (1987) Statistical methods in cancer research: the design and analysis of cohort studies. International Agency for Research on Cancer, LyonGoogle Scholar
  10. 10.
    Flanders WD, Lally CA, Zhu BP, Henley SJ, Thun MJ (2003) Lung cancer mortality in relation to age, duration of smoking, and daily cigarette consumption: results from Cancer Prevention Study II. Cancer Res 63(19):6556–6562PubMedGoogle Scholar
  11. 11.
    Stoke ME, Davis CS, Koch GG (2000) Categorical data analysis using the SAS system, 2nd edn. SAS Institute Inc., CaryGoogle Scholar
  12. 12.
    Jennrich RI, Ralston ML (1979) Fitting nonlinear models to data. Annu Rev Biophys Bioeng 8:195–238PubMedCrossRefGoogle Scholar
  13. 13.
    Cochran WG (1954) Some methods for strengthening the common chi-squared test. Biometrics 10:417–451CrossRefGoogle Scholar
  14. 14.
    Knoke JD, Shanks TG, Vaughn JW, Thun MJ, Burns DM (2004) Lung cancer mortality is related to age in addition to duration and intensity of cigarette smoking: an analysis of CPS-I data. Cancer Epidemiol Biomarkers Prev 13(6):949–957PubMedGoogle Scholar
  15. 15.
    Doll R, Peto R (1978) Cigarette smoking and bronchial carcinoma: dose and time relationships among regular smokers and lifelong non-smokers. J Epidemiol Commun Health 32(4):303–313CrossRefGoogle Scholar
  16. 16.
    Freedman DA, Navidi WC (1990) Ex-smokers and the multistage model for lung cancer. Epidemiology 1(1):21–29PubMedCrossRefGoogle Scholar
  17. 17.
    Bach PB, Kattan MW, Thornquist MD, Kris MG, Tate RC, Barnett MJ et al (2003) Variations in lung cancer risk among smokers. J Natl Cancer Inst 95(6):470–478PubMedGoogle Scholar
  18. 18.
    Thun MJ, Day-Lally C, Meyers DG, Calle EE, Flanders WD, Zhu B-P et al (1997) Trends in tobacco smoking and mortality from cigarette use in cancer prevention studies I (1959 through 1965) and II (1982 through 1988). In: Changes in cigarette-related disease risks and their implication for prevention and control: smoking and tobacco control monograph no. 8, U.S. Department of Health and Human Services, National Institutes of Health, National Cancer Institute. NIH Publication No. 97-4213Google Scholar
  19. 19.
    Thun MJ, Henley SJ, Burns D, Jemal A, Shanks TG, Calle EE (2006) Lung cancer death rates in lifelong nonsmokers. J Natl Cancer Inst 98(10):691–699PubMedCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • James D. Knoke
    • 1
  • David M. Burns
    • 1
  • Michael J. Thun
    • 2
  1. 1.Department of Family and Preventive MedicineUniversity of California at San DiegoSan DiegoUSA
  2. 2.American Cancer SocietyAtlantaUSA

Personalised recommendations