You can blow smoke in the cats face, and then let the cat decide whether it likes getting high or not. I've never had a cat that did, but I've known rats and dogs who loved toking up. Cats just don't like the smoke.
Anyways that's why God made catnip, so you could get cats high legally.
I heard about a cat who lived in a frathouse, as soon as it tried beer it turned into an alcoholic. I guess an alcoholic cat is like a regular cat but wobblier. (I don't endorse this.)