alexa Psoriasis and smoking: a systematic review and meta-analysis.
Dermatology

Dermatology

Dermatology Case Reports

Author(s): Armstrong AW, Harskamp CT, Dhillon JS, Armstrong EJ

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Abstract Psoriasis is an inflammatory skin disease associated with increased cardiovascular comorbidity. Smoking is associated with an increased risk of cardiovascular disease, and prior studies have suggested that patients with psoriasis are more likely to be active smokers. Smoking may also be a risk factor in the development of psoriasis. We conducted a systematic review and meta-analysis to assess the prevalence of smoking among patients with psoriasis, and we reviewed the contribution of smoking to the incidence of psoriasis. A total of 25 prevalence and three incidence studies were identified. The meta-analysis of prevalence studies included a total of 146 934 patients with psoriasis and 529 111 patients without psoriasis. Random effects meta-analysis found an association between psoriasis and current smoking [pooled odds ratio (OR) 1·78, 95\% confidence interval (CI) 1·52-2·06], as well as between psoriasis and former smoking (pooled OR 1·62, 95\% CI 1·33-1·99). Meta-regression analysis did not reveal any sources of study heterogeneity, but a funnel plot suggested possible publication bias. A subset of studies also examined the association between moderate-to-severe psoriasis and smoking, with a pooled OR of 1·72 (95\% CI 1·33-2·22) for prevalent smoking. The three incidence studies found an association between smoking and incidence of psoriasis, with a possible dose-effect of smoking intensity and duration on psoriasis incidence. These findings suggest that smoking is an independent risk factor for the development of psoriasis, and that patients with established psoriasis continue to smoke more than patients without psoriasis. © 2013 British Association of Dermatologists. This article was published in Br J Dermatol and referenced in Dermatology Case Reports

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