Emphysema is a condition resulting from

cigarette smoking

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liquor consumption

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drug addiction

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reduced oxygen carrying capacity of blood.

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Solution

The correct option is A cigarette smoking
Emphysema is a respiratory disorder which occurs due to the inflation or abnormal distension of the bronchioles or alveolar sacs resulting in the loss of their elasticity. Cigarette smoking and chronic bronchitis are the causes of this disease.

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