Cigarette smokers who try to quit often end up vaping and smoking WashU Medicine Quitting Smoking: Can E Cigarettes Help? The New York Times Should People Who Can't Quit Smoking Switch to E Cigarettes? Live Science Guidance for Healthcare Providers on Evaluating and Tracking Patient Use of E Cigarettes or ENDS Products American Lung Association E Cigarettes OK to Quit Smoking Moffitt E cigarettes May Have Helped 18,000 People Quit Smoking in 2015 Respiratory Therapy