Johns Hopkins researchers find thousands of unknown chemicals in electronic cigarettes Hub Vaping refers to the act of inhaling and exhaling aerosol, often called vapor, produced by an electronic cigarette or similar device. These devices heat a liquid that usually contains nicotine, flavorings, and Four In Ten Smokers Wrongly Believe Vaping Is As Harmful or Worse Than SMOKO E Cigarettes Johns Hopkins Bloomberg School of Public Health Cochlear Vaping Q&A: Johns Hopkins Expert on E Cigarettes and Tobacco Alternatives Johns Hopkins Bloomberg School of Public Health A Closer Look at the 34 FDA Authorized E Cigarettes