Johns Hopkins researchers find thousands of unknown chemicals in electronic cigarettes Hub Vape Vs E Cigarette E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) Which Smoking Habit Puts You Most at Risk? How have e cigarettes changed over time? 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