Ban 'toxic' e cigarettes indoors due to passive vaping threat, says World Health Organisation Study: higher e cigarette taxes may encourage use of traditional tobacco World Chinadaily.com.cn E cigarette world hi res stock photography and images Alamy England On Track To Be First In World To Prescribe E Cigarettes As Government Moves To Stamp Out Smoking WHO estimates at least 15 million teenagers use e cigarettes worldwide The Economic Times