Chronic obstructive pulmonary disease (COPD) is the most common chronic respiratory disease worldwide and the third leading cause of death. In Germany, about 10% of the population is affected. Fatigue, coughing and persistent massive shortness of breath are among the predominant symptoms. When these occur, COPD is usually already clearly progressed. There is no cure. However, the disease is preventable. The main causes include smoking and air pollution.