'hormone of happiness' WTF is going on here?

There are many different kinds of “endorphins”… which one specifically is “happiness”. This is incredibly vague and should not be considered science. This is not a microscopic image either. It is the graphics artists’ interpretation of an unidentified protein transporting an unidentified endorphin. In other words this is pure speculative bullshit.

You can make a hormone by not paying her.

You will own nothing, live in poverty and slavery, but you will (chemically managed) happy.

contentment must involve a lot of processes lining up. You could have that endorphin but if you've got a broken ankle it probably won't feel like nirvana.