Go deep inside the lungs to see how chronic obstructive pulmonary disease (COPD) causes chronic bronchitis and emphysema. COPD can be brought on by smoking, long-term exposure to dust and fumes, and in some cases, can be a genetic disorder.

Click here to learn more about your lungs.

Sponsored by Pfizer and Boehringer Ingelheim Pharmaceuticals, Inc. Animation produced by Visible Productions Inc.