Sobering simulation shows what really happens to your body when you inhale smoke from a vape What you're watching isn't smoke it's particulate matter size 2.5 microns (PM2.5). One vape exhale took indoor air from 2 500 in seconds. That's because vaping creates ultrafine particles Science & Tech Spotlight: E cigarettes U.S. GAO DoD to Military Members, Dependents: Steer Clear of Vaping Public Smoke and vapor may disappear but the danger doesn't. That's why it is important to preserve smoke free spaces. Tobacco smoke and vape aerosol cause indoor air pollution