+Emphysema is a chronic lung disease marked by the irreversible damage and enlargement of tiny [Air Sacs](/wiki/air_sacs). This leads to breathlessness and reduces the lung's capacity to exchange [Oxygen](/wiki/oxygen) efficiently, making each breath a struggle.
+## See also
+- [COPD](/wiki/copd)
+- [Bronchitis](/wiki/bronchitis)
+- [Smoking](/wiki/smoking)
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