To the best of my knowledge, nothing. Some cats find the scent of catnip alluring and somewhat intoxicating - they may roll around in it, eat it and play with it, then run around with a lot of energy afterwards. Other cats couldn't care less about catnip and pretty much ignore it. Either way, the catnip itself isn't a problem and there isn't anything wrong with it or the cat - it's just a normal cat behavior for some cats.
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