Vaping is not replacing smoking. It is often added to it. This is called dual use. Nearly half of e cigarette users still smoke cigarettes. What this means: Smoking continues alongside vaping What We Know About Vaping Smokefree Cigarette smokers who try to quit often end up vaping and smoking WashU Medicine Should People Who Can't Quit Smoking Switch to E Cigarettes? Live Science E Cigarettes More Successful in Helping Smokers Quit Respiratory Therapy E Cigarettes Vaping Information