A study of second hand exposure to marijuana smoke done by the University of Calgary has confirmed what a Johns Hopkins School of Medicine study concluded a couple of years ago about the effect.
The active ingredient in marijuana, T-H-C, can be detected in your body after just 15 minutes of exposure if you're in a poorly ventilated room. This could be a kitchen, basement or living room with the windows closed.
What's more, it can still linger in your system for between 24 and 48 hours. That could prove risky for those people who work in jobs with a zero-tolerance drug policy.
The Johns Hopkins study discovered those people exposed to secondhand marijuana smoke in a room with fans running just got hungry.