[Sundae]

I think happiness is a state of mind.
Because there are too many factors which can mean it is not an active choice. You can choose to make the best of things, yes. But that doesn't mean you will be happy.

Certainly (and of course I am talking specifically about my own experience) small things can make you happy if you choose to notice them. But mental health/ addiction/ living conditions/ finances can affect you far more immediately than any mental choice you make.

It is an interesting question though. I often do an inventory to find positive things to offset problems which start to overwhelm me. Positive thinking can be learned. Happiness? Still working on that.