Smoking slowly damages your lungs, often without clear symptoms at first. Every cigarette releases thousands of toxic chemicals that enter your airways and lungs. Over time, this damage becomes serious and sometimes COPD Treatment with Stem Cells. Chronic Obstructive Pulmonary Disease Swiss Medica But I Don't Really Smoke!: E Cigarettes and Pulmonary Disease COPD Updates Chronic obstructive pulmonary disease Nature Reviews Disease Primers