A common cause of chronic respiratory failure is chronic obstructive pulmonary disease (COPD). <br/><br/>What is the most common cause of COPD?

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AInhalation of toxic fumes
BCar accidents
CMuscular dystrophy
DSmoking

✓ Correct answer: D. Smoking Smoking is the most common cause of COPD. COPD is a collection of conditions that impair the flow of air into and out of the lungs (suchg as emphysema and bronchitis).

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A common cause of chronic respiratory failure is chronic obstructive pulmonary disease (COPD). <br/><br/>What is the most common cause of COPD?

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