Harley Street Psychiatrist Dr Raj Persaud, who sees many very high net worth and very smart people in his clinical practice, explores why there is such a weak statistical relationship between high intelligence and happiness and indeed why being smart may prevent you from finding happiness. One key issue is how we think about being smart an issue that has come under sharper focus in the world of Artificial Intelligence and maybe we need to rethink what it is to be smart now more than ever, also, another issue is the tendency for smart people to worry more and finally there is the issue of what happiness is anyway, and whether maybe being happy is not something smart people actively pursue because they think... well, they think it's just not smart.