Chronic obstructive pulmonary disease (COPD) is a representative chronic inflammatory disorder of the lungs that includes chronic bronchitis and emphysema. COPD is characterized by airway inflammation and progressive airflow obstruction, most commonly caused by cigarette smoking. The major symptoms of which patients complain are cough, breathlessness, and sputum production. COPD is associated with underlying inflammation in response to chronic exposure to noxious particulates and gases and with a number of comorbid conditions. The onset of COPD generally occurs in the 6th to 8th decades of life. Early onset COPD is defined as disease onset before the age of 50 years, irrespective of smoking history. The presence of persons with early onset, severely reduced pulmonary function suggests that individuals may vary in their genetic susceptibility to the effects of smoking. Alpha-1-antitrypsin deficiency is the only proven genetic risk factor for COPD. Bronchodilators are the mainstay of treatment since they improve lung function and reduce acute exacerbations. Long-acting inhaled bronchodilators are recommended as first line treatment for patients with persistent symptoms.