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Hi Mary. Welcome to Just Answer. My name is***** and I've been a veterinarian for 15 years. Thank you for your question about Tigerboy. The licking of the plastic bags by him like this most likely is being done as he likes the act of it, the texture of the bag or possibly some odor on the bags. My older cat does this all the time too! If a plastic grocery bag is left out, she will find it and lick it for a couple minutes. She usually discovers the bag at 2 in the morning in the bedroom and I get woke up to the bag being licked. It isn't necessarily a sign of a health issue. It isn't bad, unless they were to start chewing on it and eat portions. The best thing to do to avoid it is to keep the bags put away.