 Emphysema is a progressive, debilitating disease characterized by destruction of lung tissue as a result of inflammation caused by exposure to noxious inhaled agents for extended periods. The most common cause of this condition is cigarette smoking, although genetic, occupational, and environmental causes account for up to 10 of cases. Despite aggressive public health initiatives aimed at discouraging the use of cigarettes, smoking-related lung diseases remain a significant cause of disability and death worldwide. Due to the number of current and new smokers, emphysema is expected to remain a leading cause of morbidity and mortality for years to come. 