Well, it depends in what you want in life. If you want to be a joker, and laugh a lot. You will do that, if you want to be a boss and do other things, you will not be a clown. And start not laughing. It just depends on what you want. If you are satisfied with your role as a laugher, who cares then? the important person is you who should decide?
Now, people don't like people who laugh a lot because its not good to be funny all the time. Be moderate that's all.. Everything needs balance in life, or we would have been working all day long.
Now heath issues: laughter has its benefits, but if you laugh too hard it's not good for you body because the body interprets the same as if you were underso much stress. So that's why balance in life is important. Don't be a depressed person or a dead laugher.