Important distinction.

Most clearly seen in those "surveys" showing people from the Scandinavian countries to be the "happiest" people in the world. They are NOT. Because I know the languages, I can read some of the articles in the local languages... and they invariably point out that "over there" happiness is actually viewed as "life satifaction and contentment."

"Happiness" is what people feel when they eat a particularly delicious slice of cake. Or set a new personal best with their workout. Or something like that.