Journal
AMERICAN JOURNAL OF MEDICINE
Volume 120, Issue 11, Pages 953-959Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.amjmed.2007.06.020
Keywords
cessation; cigarette; cohort; pack; years; passive; prospective; psoriasis; risk factors; smoking
Categories
Funding
- NCI NIH HHS [CA50385, R01 CA050385, R01 CA050385-20] Funding Source: Medline
- NIAMS NIH HHS [T32 AR007258-29, 5 T32 AR007258-29, T32 AR007258] Funding Source: Medline
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Psoriasis is a common, chronic, inflammatory skin disorder. Smoking may increase the risk of psoriasis, but no prospective data are available on this relation. METHODS: We prospectively examined over a 14-year time period (1991-2005) the relation between smoking status, duration, intensity, cessation, and exposure to secondhand smoke, and incident psoriasis in 78,532 women from the Nurses Health Study II. The primary outcome was incident, self-reported, physician-diagnosed psoriasis. RESULTS: We documented 887 incident cases of psoriasis. Compared with those who had never smoked, the multivariate relative risk (RR) of psoriasis was 1.78 (95% confidence interval [CI], 1.46 to 2.16) for current smokers and 1.37 (95% CI, 1.17 to 1.59) for past smokers. Compared with nonsmokers, the multivariate RR of psoriasis was 1.60 (95% CI, 1.31 to 1.97) for those who had smoked 11- 20 pack-years and 2.05 (95% CI, 1.66 to 2.53) for those who had smoked >= 21 pack- years. Compared with never smokers, the multivariate RR of psoriasis was 1.61 ( 95% CI, 1.30 to 2.00) for those who quit smoking < 10 years ago, 1.31 ( 95% CI, 1.05 to 1.64) for 10-19 years ago, and 1.15 ( 95% CI, 0.88 to 1.51) for < 20 years ago. Prenatal and childhood exposure to passive smoke was associated with an increased risk of psoriasis. CONCLUSIONS: In this prospective analysis, current and past smoking, and cumulative measures of smoking were associated with the incidence of psoriasis. The risk of incident psoriasis among former smokers decreases nearly to that of never smokers 20 years after cessation. (C) 2007 Elsevier Inc. All rights reserved.
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