Impact and Timing of Smoking Cessation on Reducing Risk of Rheumatoid Arthritis Among Women in the Nurses' Health Studies

Arthritis Care Res (Hoboken). 2019 Jul;71(7):914-924. doi: 10.1002/acr.23837.

Abstract

Objective: To investigate the impact and timing of smoking cessation on developing rheumatoid arthritis (RA) and serologic phenotypes.

Methods: We investigated smoking cessation and RA risk in the Nurses' Health Study (NHS) (1976-2014) and the NHS II (1989-2015). Smoking exposures and covariates were obtained by biennial questionnaires. Self-reported RA was confirmed by medical record review for American College of Rheumatology/European League Against Rheumatism criteria. Cox regression was used to estimate hazard ratios (HRs) and 95% confidence intervals (95% CIs) for RA serologic phenotypes (all, seropositive, seronegative) according to smoking status, intensity, pack-years, and years since cessation.

Results: Among 230,732 women, we identified 1,528 incident cases of RA (63.4% of which were seropositive) during 6,037,151 person-years of follow-up. Compared with never smoking, current smoking increased the risk of all RA (multivariable HR 1.47, 95% CI 1.27-1.72) and seropositive RA (HR 1.67, 95% CI 1.38-2.01) but not seronegative RA (HR 1.20, 95% CI 0.93-1.55). An increasing number of smoking pack-years was associated with an increased trend for the risk of all RA (P < 0.0001) and seropositive RA (P < 0.0001). With increasing duration of smoking cessation, a decreased trend for the risk of all RA was observed (P = 0.009) and seropositive RA (P = 0.002). Compared to recent quitters (<5 years), those who quit ≥30 years ago had an HR of 0.63 (95% CI 0.44-0.90) for seropositive RA. However, a modestly increased risk of RA was still detectable 30 years after quitting smoking (for all RA, HR 1.25 [95% CI 1.02-1.53]; for seropositive RA, HR 1.30 [95% CI 1.01-1.68]; reference, never smoking).

Conclusion: These results confirm that smoking is a strong risk factor for developing seropositive RA and demonstrate for the first time that a behavior change of sustained smoking cessation could delay or even prevent seropositive RA.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult
  • Aged
  • Anti-Citrullinated Protein Antibodies / blood
  • Arthritis, Rheumatoid / blood
  • Arthritis, Rheumatoid / diagnosis
  • Arthritis, Rheumatoid / epidemiology
  • Arthritis, Rheumatoid / prevention & control*
  • Biomarkers / blood
  • Female
  • Humans
  • Incidence
  • Middle Aged
  • Nurses
  • Prospective Studies
  • Protective Factors
  • Rheumatoid Factor / blood
  • Risk Assessment
  • Risk Factors
  • Serologic Tests
  • Smoking / adverse effects*
  • Smoking / epidemiology
  • Smoking Cessation*
  • Time Factors
  • Women's Health*

Substances

  • Anti-Citrullinated Protein Antibodies
  • Biomarkers
  • Rheumatoid Factor