The study was designed prospectively. Patients with COPD who apply to the pulmonary rehabilitation outpatient clinic will be included.
The data of patients with COPD who are eligible for PR and have been pre-evaluated will be scanned. Respiratory function test, arterial blood gas analysis, six-minute walking test (6-MWT), mMRC Dyspnea Scale, St George Quality of Life Questionnaire and Hospital Anxiety Depression Scale will be used in the study. Patients with COPD who smoke will constitute the study group, and those who quit smoking will constitute the control group.