Differential Toxicity of Electronic Cigarette Aerosols Generated from Different Generations of Devices In Vitro and In Vivo Environment & Health Frontiers An Automated Aerosol Collection and Extraction System to Characterize Electronic Cigarette Aerosols Fume Cigarette Electronique Composition fume blu E cigarettes, aka JUULs and vape pens, use a battery to heat up a special liquid into an aerosol that users inhale. It's not just harmless water vapor. The "e juice" that fills the Chemical Composition of Aerosols of an Electronic Cigarette Aerosol and Air Quality Research