Is Happiness a Choice?

I'm beginning to believe that happiness really is, in considerable part, a choice. That it is up to is to decide how to see things and process them and react to them.

Obviously, there are objectively hard times in our lives, times during which it feels nearly impossible to be so sunny and upbeat and existentially grateful, but all things being equal, I do think we have a fair bit of control over how happy we are.

What do you guys think?