Emphysema is a type of chronic obstructive pulmonary disease (COPD) that leads to the loss of the air sacs in the lungs. As a consequence, a person with emphysema has a smaller lung capacity and may have trouble breathing. Emphysema is a respiratory condition that affects a significant number of people in the United States; around 3.7 million people have been identified as having the condition. It ranks as the third leading cause of death among adults in the United States. Emphysema is most likely to develop in those who are 45 years of age or older
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