How does e cigarette vapor alter the gut microbiome, body weight, and systemic inflammation levels? E Cigarette Use Increases Uveitis Risk, Study Finds Differential Toxicity of Electronic Cigarette Aerosols Generated from Different Generations of Devices In Vitro and In Vivo Environment & Health 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