Prevalence of tobacco smoking and its association with disease severity and psoriatic arthritis among patients with nail psoriasis in China: a cross-sectional study

Patients with nail psoriasis have higher smoking rates and smoking intensity compared to those without nail psoriasis. The total nail involvement count was higher in current smokers than in non-smokers. Smoking intensity was positively associated with total nail involvement count and individual nails with > 90% area involvement count. Current smoking was a negative associated factor for PEST risk level. Both current smoking and severe smoking were negative associations with the presence of psoriatic arthritis.