Although chronic obstructive pulmonary disease, or COPD, is the fourth leading cause of death in the United States, this lung disease is still unknown to many people including the active smokers who are most at risk for lung diseases like this one. Understanding this illness starts with an in-depth look at pneumonia and bronchitis (the two lung diseases which, together, make up COPD) and includes information on treatment and active prevention and yes, we're going to tell you to quit smoking.

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