Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Addressing Secondhand Smoke: Tobacco and Cannabis Smoke in Multi Unit Housing Characteristics of second hand exposure to aerosols from e cigarettes: A literature review since 2010 ScienceDirect It's Not Just Cigarettes: Vape Residue Sticks on Surfaces Too Thirdhand Smoke Resource Center