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When you breathe out, the air sacs deflate and the air goes out.

Breathing in secondhand smoke, which is in the air from other people smoking; air pollution; or chemical fumes or dusts from the environment or workplace also can contribute to COPD.

Most people who have COPD have both emphysema and chronic bronchitis, but the severity of each condition varies from person to person. Outlook COPD is a major cause of disability, and it is the fourth leading cause of death in the United States.

Currently, 16 million people are diagnosed with COPD.

At the same time, a waste product, called carbon dioxide (CO2) gas, moves from the capillaries into the air sacs.

This process, called gas exchange, brings in oxygen for the body to use for vital functions and removes the CO2. When you breathe in, each air sac fills up with air, like a small balloon.

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