This is a name for a group of conditions that make it difficult to breathe. This group of conditions is most commonly caused by smoking.

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Chronic obstructive pulmonary disease (COPD) is a group of lung diseases that include chronic bronchitis and emphysema, which make it hard to breathe. Smoking is the most common cause of COPD. Influenza and tuberculosis are infectious diseases that affect the respiratory system but are not typically associated with long-term breathing difficulties. Asthma is a chronic respiratory condition characterized by spasms of the airways, but it can have a variety of causes beyond smoking.

This Is a Name for a Group of Conditions That