E cigarette users trying to quit smoking should vape every day, studies suggest Smoking The Guardian Smoking cessation: supporting patients to break the cycle bpacnz Population Based Disease Odds for E Cigarettes and Dual Use versus Cigarettes NEJM Evidence What happens when you quit smoking and start vaping? E cigarettes, varenicline and cytisine are the most effective stop smoking aids, analysis of over 150,000 smokers reveals Cochrane