Is there such thing as a phobia of chocolate?

Yes, there is a specific phobia called "Theobromine phobia" which is a fear of chocolate. Theobromine is a chemical found in chocolate that can be toxic to some animals, and this fear can be related to concerns about the effects of theobromine on health. While this phobia is not as common as other phobias, it can still affect individuals who have a strong aversion to chocolate.