Smiling. For some of us, it comes as naturally as breathing, and believe it or not, it has almost as many benefits, too! For example, studies have shown that being smiled at by a stranger can improve your mood - and make you want to smile back. Smiling has even been found to boost the immune system, and people who smile often live an average of seven years longer than people who don’t. With all that’s known about the benefits of a simple smile, it’s a wonder more of us aren’t grinning ear-to-ear all the time.