These are Stark Raving Cat's Catnip Joints ($10 for five). They're sealed cloth joints filled with catnip. In a perfect world, your cat will hold one in its mouth like a real joint so you can take pictures and post them on Facebook and get a ton of likes. In the real world, your cat will only roll around on them and bat them under the sofa. I remember giving my cats catnip back in the day. They would go nuts making all sorts of demonic purrs then run into the walls trying to escape their own tails. It was so fun to watch I cancelled my cable and internet for a whole month.
Keep going for a blurry shot of a cat holding one in its mouth.
Thanks to PYY, who told me you can get high by smoking catnip but I tried it and all I could do is understand cat meows for two minutes, followed by a headache.