<unk>  <unk>  is one of the most common lung diseases. It makes it difficult to breathe. There are two main forms of<unk> . They are<unk>  bronchitis, defined by a long-term cough with mucus and Emphysema, defined by destruction of the lungs over time.
Most people with<unk>  have a combination of both conditions.
Chronic obstructive pulmonary disease
Asthma
Chronic bronchitis
Exercise induced asthma
Alpha 1-antitrypsin deficiency
Obstructive lung disease
Occupational asthma
Pulmonary amyloidosis