Which of the following is the most important risk factor for development of chronic obstructive pulmonary disease?
  1. Cigarette smoking
  2. Occupational exposure
  3. Air pollution
  4. Genetic abnormalities
Explanation
Answer: A - Chronic obstructive pulmonary disease (COPD) is a respiratory ailment that is comprised of three disorders: chronic bronchitis, emphysema, and asthma. Smoking is the most common cause.
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