PICOT Question: In adults with existing COPD(P), does Varenicline (I) in comparison to nicotine replacement therapy (NRT) (C) have a higher success rate in COPD patients attempts to quit smoking (O) in a 12-month period(T)?

In adults with existing COPD(P), does Varenicline (I) in comparison to nicotine replacement therapy (NRT) (C) have a higher success rate in COPD patients attempts to quit smoking (O) in a 12-month period(T)?

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