Whether you're a presidential front-runner, or an Academy Award-winning actor, or head of a TV ministry, if you stay in the public eye long enough they're going to try and find a scandal.
Smiling can be a deliberate, intentioned act. When it is that, it becomes an act of creation, and a powerful tool. Be quick to smile, and quick to share your smile with others. You will light up your heart and light up the room.