The pursuit of happiness is so intrinsic to the American psyche that the phrase was written into the Declaration of Independence in 1776. But new research suggests that just like ice cream and chocolate cake, too much happiness can be detrimental to our well-being. Maurice Schweitzer, Wharton professor of operations, information and decisions, found that abundantly happy people are perceived as innocent and unsophisticated, which makes them more vulnerable to deception. Schweitzer recently spoke about his research and explained why extremely happy people may want to dial it down on the Knowledge at Wharton show on SiriusXM’s Channel 111 . An edited transcript of the conversation follows. Knowledge at Wharton: What got you to look at this topic? Maurice Schweitzer: Happiness is something that we tend to think is always good. There’s a positive psychology field that says we should be positive, upbeat, we should strive for happiness. The pursuit of happiness is deeply embedded in our national thinking.…