Secondhand Exposure to E Cigarettes Puts COPD Patients At Risk Respiratory Therapy Health effects in COPD smokers who switch to electronic cigarettes: a COPD Dove Medical Press Vaping increases risk for asthma, COPD, other lung diseases UPI.com Marijuana and Your Lungs: Is Vaping Safe for People with COPD? Vaping doubles risk of serious lung disease, even without smoking history study Professor Erwin Loh