How could it be otherwise?
I know, I know, some are thinking "but that could be unhappiness as well." That is true. Henry Ford is reputed to have said "If you think you can, or if you think you can't, you're right." The same will hold for Happiness. Happiness is not a place or an achievement. Happiness is a state of Being that is created by thinking. Granted, people who substitute "feelings" for thinking will never be happy, since feelings are indicators of thinking. Abraham Lincoln supposedly noted that "a person is as happy as he makes up his mind to be." For some, it is their definition of "happiness" that is the issue - they link their personal "happiness" directly to other people, conditions, or circumstances. Their happiness is thus dependent on what someone else/something else does (or does not do.) And, yes, there are those folks who are so removed from genuine "happiness" that their concept of being happy is for other people to suffer. The misery loves company, crab bucket, manner of living.
Happiness can not exist without the thought of happiness. Choose to be happy. Keep that thought. Be grateful for your experience. And, appreciate yourself and all that is. That's the formula.