This is a pilot study on the impact of switching from cigarettes to Electronic Cigarettes on disease-related clinical symptoms and biomarkers of harm in smokers with preexisting COPD

You will be asked to reduce your cigarette smoking and use study-provided e-cigarettes for 3 months. You will be asked to attend 2 in-person visits at the Hershey Medical Center and participate in 4 telephone visits. Throughout the study you will be asked to complete questionnaires, have heart rate, blood pressure and pulse oximetry taken, electrocardiograms (ECGs), height and weight measured, provide medical history, perform pulmonary function tests, complete a 6-minute walk, have your exhaled carbon monoxide measured, provide urine specimen and have blood drawn.