Latest Cochrane Review finds high certainty evidence that nicotine e cigarettes are more effective than traditional nicotine replacement therapy (NRT) in helping people quit smoking Cochrane What happens when you quit smoking and start vaping? Major Study Says E Cigarettes Can Help Smokers Quit Study: Vaping Does Not Help U.S. Tobacco Smokers Quit Study: E Cigs Better Than Gum, Patches in Helping Smokers Quit Vaping: It's hard to quit, but help is available Harvard Health