In a recent study conducted by the University of Southern California, researchers discovered that many homes in Los Angeles have been exposed to THC, the active ingredient in cannabis, without the knowledge of the residents. The study found that THC was present in the air of homes, even if no cannabis was being smoked inside. This is due to the fact that THC-containing smoke can travel through the air and into other homes, leading to involuntary exposure to THC. This has important implications for public health, as THC exposure can have a variety of adverse health effects.

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source: Phys.org