Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Secondhand smoke and secondhand aerosol Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Does Vaping Cause Second Hand Smoke V2 Cigs UK Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Secondhand vape exposure dangerous for kids The Star