Yeah, I would also have to disagree that more intelligent people tend to be unhappy. I think that I am a little sharper than most of the "crowd" (excluding this crowd, because most here are sharper than the rest of their "crowds"
)... and this is because -like many others here- I grew up with a loving family who supported my inquisitive nature and only helped fuel my curiosity. I love learning, reading, taking things apart, building things... you name it, and as most people would agree that pretty little streaks of paint on a canvas are art (which I agree with), I also have to claim that I view the electrical phenomena, geometry, calculus, and computer programming as equally beautiful, I see them as art just the same... as long as there is new code to write, new things to build, and new shapes and formulas to comprehend... I will be happy.
I think that the more a person knows, the higher their happy-potential goes. The more that they can understand, the more they can appreciate something. For instance, if someone doesn't understand the inner workings of their cell phone, they just see it as a nice little novelty... but if you understand the nature of transistors, electromagnetic waves, and gallium nitride... etc, you can truly appreciate the complexity of the device, and appreciate the many hundreds of thousands of man-hours in research that have been invested in the component technologies...
I think that if someone who is intelligent feels unhappy as a result of their intelligence has either proven there is no escape from heat death, or would be equally unhappy as a dumber person... it just has to do with their personality