E Cigarettes and Vape Devices NH Department of Environmental Services 6 important things to know about IQOS Johns Hopkins researchers find thousands of unknown chemicals in electronic cigarettes Hub What are e cigarettes and the controversies that surround them? On Medicine CDC: E cigarettes a growing health concern 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