I actually would not expect smart people to be happier. In fact, I wouldn't expect any group of people to be particularly happier than anyone else. Happiness and suffering are two sides of the same coin and we evolved these feelings (or they were bestowed upon us by God, either way) in order to guide us. We do more of what feels good, less of what feels bad. If we're happy all the time, happiness loses its intended p…
Stoicism and buddhism never worked for me—observing the world as dispassionately as possible is the most dead I’ve ever felt inside. Pouring myself out as passionately as possible to what I consider my life’s work is the happiest, most satisfying feeling in the world, and that’s despite the setbacks. I still come across as stoic to some people, though, just because it takes a lot (if at all) to upset me, but my calmn…
For my money, I prefer the dispassionate route. I get way too hung up on results and expectations otherwise.