Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Secondhand Exposure to E Cigarettes Puts COPD Patients At Risk Respiratory Therapy Evidence Mounts About the Health Impact of Second Hand Vaping Bisnar Chase Study shows second hand vaping exposure very low compared to second hand smoking Don't Be Fooled, E cig Aerosol Is Not Harmless for Kids American Lung Association