Passive smoking is the inhalation of smoke, called second-hand smoke (SHS), by persons other than the intended "active" smoker. It occurs when marijuana smoke permeates any environment, causing its inhalation by people within that environment.
- Could Second-Hand Pot Smoke Make You Fail a Marijuana Test? by Douglas Main (October 21, 2014), Newsweek
- Secondhand marijuana smoke may harm blood vessel function as much as cigarette smoke by Melinda Carstensen (November 17, 2014), Fox News
- Secondhand Pot Smoke Can Make You Fail a Drug Test (May 19, 2015), LiveScience.com