Cats love getting high on catnip almost as much as humans love getting them high on catnip—and it's totally legal and sold in stores everywhere! But what causes cats to get rolling-on-the-ground-and-drooling stoned when they rub all up in that nip? Basically, it overloads all 5 senses at once, turning your cat's brain into an over-excited pinball machine. Here's where it gets weird, though: there's also a sexual element to it. Yeah. It simulates cat pheromones.