Is COPD contagious?

Chronic obstructive pulmonary disease is a chronic disease. The lung function of patients gradually deteriorates. Carbon dioxide stays in the body and there are symptoms of hypoxia. It can be said that it is an organic chronic disease. It is not caused by a certain bacterial virus, so it is not contagious. Since chronic obstructive pulmonary disease is not contagious, what causes the disease? Research shows that the exact cause of COPD is not clear, but it is believed to be related to abnormal inflammatory responses of the lungs to harmful gases such as cigarette smoke or harmful particles. These responses exist individual susceptibility and environmental factors interact, and smoking is the most important pathogenic factor of COPD.