More than half of the nearly-three million people in Great Britain who vape are ex-smokers, a new survey suggests. For the first time, more than half of the current 2.9 million e-cigarette users have since given up smoking, Action on Smoking and Health (Ash) said in its annual survey into the use of electronic cigarettes and vapourisers. Many vapers still "dual-use" combustible and electronic cigarettes, which means they are still exposed to the cancer causing substances in tobacco smoke, the study added. Ann McNeill, professor of tobacco addiction at King's College London, said: "This year's Ash survey finds that around 1.5 million vapers are ex-smokers, for the first time a larger number than those who continue to smoke.