Risk factors, chronic respiratory symptoms and respiratory function in the natural history of COPD will be monitored. In a group of patients with a comorbid course of COPD and atherosclerosis, systemic inflammation and its molecular mechanisms will be investigated. Also in this group, the role of non-coding miRNAs will be analyzed. The study also includes an analysis of the clinical and biochemical COPD phenotype with systemic inflammation and comorbidity.