COPD is a debilitating disease that causes significant morbidity and mortality, and despite being a preventable disease, its prevalence is rising because of the smoking epidemic.1 It is the fourth most common cause of death worldwide, and the World Health Organization estimates it to become the third by 2030.2 In 2008, 12.1 million US adults were estimated to have COPD,3 and it is a common comorbi