Scientists Warn Against Breathing in Secondhand Vape 'Smoke' Newsweek Have you ever breathed in secondhand vapor from a vape? What exactly are you inhaling? It turns out it's a lengthy list of chemicals. FULL STORY Vaping, Second Hand Smoke, and Kids Medical Associates of Northwest Arkansas Many people assume vaping is harmless to bystanders, but secondhand aerosol can contain ultrafine particles and chemical residues. Researchers are examining how exposure may affect airways and overall health, especially for children