Vaping is not safe and is harmful to health, WHO says, both for users and bystanders South China Morning Post In recent years, the number of e cigarette users worldwide has sharply increased, with many believing that vaping is less harmful than smoking traditional cigarettes. However, health experts are warning of its negative Nicotine E Cigarettes Help Smokers Quit, Major Review Finds Debate: Are e cigarettes beneficial to public health? Pro Con