“Many people are exposed to secondhand cannabis smoke,” says lead author Evan S. Herrmann, Johns Hopkins University School of Medicine postdoctoral fellow. That’s when researchers found the drug’s active ingredient, tetrahydrocannabinol, or THC, and other byproducts could turn up in nonsmokers’ bodies after an hour or more spent in extreme conditions with heavy smokers in an enclosed space. The study examined the response time of individuals exposed to the second-hand smoke compared to them without the smokey influence. The result showed a significant delay in response time when exposed to the second-hand smoke. In addition, extreme exposure may influence a drug test for THC. The study was supported by the The Substance Abuse and Mental Health Services Administration. Read more about it [here] .