noun
a condition in which the air sacs of the lungs are damaged and enlarged, causing breathlessness
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Emphysema is a chronic lung condition characterized by the damage of the air sacs in the lungs.
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My grandfather has emphysema from smoking for many years.
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I heard that smoking can give you emphysema, so I'm trying to quit.
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The pollution in the city was like a slow poison, causing emphysema in the environment.