Health Information Leaflet Service E cigarettes around 95% less harmful than tobacco estimates landmark review GOV.UK Use of e cigarettes after quitting smoking increases lung cancer risk Cancerworld Magazine Comparing the cancer potencies of emissions from vapourised nicotine products including e cigarettes with those of tobacco smoke Tobacco Control Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis E cigarettes may help over 50,000 smokers to quit in England each year UCL News UCL University College London