Non-interventional Study of the Effect of Smoking Status of the Patient on the Success of Etanercept Therapy in Psoriasis

Inclusion Criteria:

Clinical diagnosis of chronic plaque type psoriasis for at least 6 months as determined by the subjects medical history, and confirmation of the diagnosis through physical examination by the investigator Patients who are scheduled by their dermatologist to initiate treatment with Etanercept

Exclusion Criteria:

Previous or current treatment with antipsoriatic biologic drugs, such as etanercept, infliximab, adalimumab, ustekinumab, alefacept, efalizumab Chronic or acute infections requiring intravenous or oral anti-infectives within 14 days prior to the Baseline visit