A new study published in Nicotine & Tobacco Research found that those using e cigarettes alone were more than twice as likely to develop COPD than people who didn't use any tobacco products, Chronic Obstructive Pulmonary Disease (COPD) Emphysema vs. Chronic Bronchitis: What's the Difference? Patient Basics: Chronic Obstructive Pulmonary Disease (COPD) 2 Minute Medicine COPD: Chronic Bronchitis vs. Emphysema COPD is an umbrella term that commonly includes chronic bronchitis and emphysema, two conditions with very different presentations. Chronic Bronchitis (Blue Bloater) Productive cough