Secondhand marijuana smoke: What are the risks to your health? UCLA Health Have you ever breathed in secondhand vapor from a vape? What exactly are you inhaling? It turns out it's a lengthy list of chemicals. FULL STORY Secondhand exposure from vaping marijuana: Concentrations, emissions, and exposures determined using both research grade and low cost monitors ScienceDirect Secondhand Smoke Vermont Department of Health Does cannabis create thirdhand smoke? Thirdhand Smoke Resource Center