Genetic predisposition ---- wool sucking, is seen more frequently in Siamese and Birman cats.
Environmental factors. Is the cat bored or seeking attention?
Compulsive disorder. Once other possibilities are ruled out, some pet behavioralists start to look into the possibility of compulsive disorder.
munching on live power cords can be hazardous to a cat’s health–but the other danger is that ingested materials can get stuck in your cat’s stomach or intestine, which can obstruct the passage of food and may cut off the blood supply to organs–either scenario can be fatal
As well, many houseplants are toxic to cats; chewing or eating these plants can have mild symptoms as well as fatality. If your cat has a history of ingesting non-food items and becomes lethargic, vomits, or displays other concerning behavior, take them to your veterinarian immediately See the ASPCA’s full list of plants toxic to cats
More at the site

I used to have a cat that loved dental floss. If I couldn't find him I'd haul out the dental floss and yank out a few feet, He'd come literally tearing in from where ever he had been to play with it and pull it through his teeth.

I know a guy who loves tinsel off the Christmas tree. What a boo-boo head he is.

None of my cats eat non-food items, but my little Murphy will go totally bonkers for melon, plums, raspberries, raw tomatoes, onion tops and corn on the cob. He likes fruit and veggies better than meat!

Mine likes cucumbers. Also, he doesn't appear to even hear the can opener, but if I pop open one of those cans with the top you have to peel off, you can hear him coming like a herd of elephants! LOL He also likes to rip paper to shreds and chew it, but doesn't swallow it. The vet says he's flossing his teeth that way.

*LOL* Yup, they do sound like a whole stampede, don't they?

Another of my cats can tell the difference between the sound of a spoon stirring a cup of coffee and a spoon stirring a cup of cocoa, (which he loves). No hiding cocoa from him! He'll practically drool til he gets some on a saucer. (He just gets a spoonful though, since some say it's toxic to cats.) Onions are too, but how do you keep a dog-breath-obsessed cat out of the veggie garden? .