Normally speaking, cats cannot eat leeks. If a cat at home eats a small amount of leeks, it may be poisoned, but there are also cases where it will be fine. Cats will have physical reactions within 2-12 hours after eating by mistake, such as vomiting, diarrhea, drooling, convulsions, etc. This is a state of food poisoning. The owner should send him to the doctor as soon as he discovers it.