Validation of smoking cessation self-reported by patients with chronic obstructive pulmonary disease.

Purpose: The present study reports on the biochemical validation of the self-reported smoking status of patients with chronic obstructive pulmonary disease (COPD). The objective is to establish the proportion of overestimation of self-reported success rates.

Methods: A cross-sectional smoking-status validation study including 60 patients with COPD who reported that they had stopped smoking.