As PJ O'Rourke points out in Modern Manners:
"A tip for cat lovers: do not give your cat cocaineIf there's one thing worse than freaking out at imaginary burglars while high, it's calling for the real police.
Fifteen years ago it was fashionable to blow marijuana smoke in your cat's face and watch it 'get mellow'. This was fine for marijuana. Do not, however, give your cat cocaine. If you do, it will climb the wallpaper, shred the drapes, and tear apart every piece of furniture in the house looking for cat-nip so it can get to sleep. Then it will spend the night howling in the backyard, and, after you've passed out, will sneak back in the house and take all the rest of your cocaine.
For the same reasons, do not give cocaine to other animals. In particular, do not give cocaine to animals that aren't there, such as the giant spiders you think you are seeing under the couch."