Oh, the insidiousness. It begins with experimentation. Eventually they're rolling on the floor, hopelessly hooked.
If your cats can't say no to catnip, check out the video above to better understand.
The Pet Collective-posted video on the five stages of catnip addiction -- titled "Cats On The Nip" -- cuts to the heart of this feline scourge.
Remember, kitties, first one's free.
(Hat tip, Laughing Squid)