Is passive vaping a hidden risk to the public? Here's what the experts know so far ABC News Understanding the Hidden Health Risks of Vaping UL Research Institutes Secondhand Exposure to E Cigarettes Puts COPD Patients At Risk Respiratory Therapy Is Secondhand Vaping Harmful To Your Health? Health experts say not to 'vape' around children, because the secondhand aerosol (it isn't vapor) from e cigs isn't safe for them Kentucky Health News