Chronic obstructive pulmonary disorder (COPD) is a term used to describe a range of chronic airway disorders characterized by airflow limitation that is not fully reversible. Although genetics and environmental factors contribute to the development of COPD, smoking is the most important single cause.

Of major concern is the World Health Organization’s prediction that because of the increased prevalence and poor treatment, COPD will become the third most common cause of death worldwide by 2020 and exact an enormous economic burden.