Vaping is not safe and is harmful to health, WHO says, both for users and bystanders South China Morning Post Tobacco Smoke, Vaping, and Asthma AAFA.org Vaping lung illness: Harmful chemicals found in e cig flavoring juice Secondhand exposure from vaping marijuana: Concentrations, emissions, and exposures determined using both research grade and low cost monitors ScienceDirect Juul study shows secondhand vaping emissions are less toxic than cigarette smoke