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Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 16 years of experience. I look forward to working with you.
The good news is bell peppers are not toxic to cats. But the leaves could certainly cause irritation to the stomach, possibly mouth which is why he is vomiting. If he had one or two vomits and seems fine (eating/drinking normally with good attitude) then you could monitor, but if the vomiting continues, then he needs to be seen by his veterinarian for an exam, possibly some lab work to ensure the eating of the leaf is not coincidental and there is really something else going on. Some cats' stomachs get so irritated from leaves that they require one or two days of medication to alleviate the stomach inflammation. Your vet can provide this.
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