In an article in Business Insider, Cecilia Hillard, PhD, (Neuroscience Research Center, Pharmacology and Toxicology) said that a “contact high” from exposure to marijuana smoke is a psychological phenomenon. She explained that tetrahydrocannabinol, (THC) the active ingredient in marijuana, is trapped in the lungs; little residual THC is present in exhaled air.
Business Insider, January 16, 2014
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