Cat owners flood the internet with videos of their kitties euphorically rolling and flipping out over catnip-filled bags and toys. But exactly how catnip—and a substitute, known as silver vine—produces this feline high has long been a mystery. Now, a study suggests the key intoxicating chemicals in the plants activate cats’ opioid systems much like heroin and morphine do in people. Moreover, the study concludes that rubbing the plants protects the felines against mosquito bites.
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