How much smoke? Do you always see it? Are you sure it's smoke and not condensation? I'm not sure if it''s a problem or not. Your camera's flash does put out a lot of energy, although it happens so quickly you won't feel it. If there's condensation or something on the camera, I could see that it might vaporize. I think that I wouldn't worry about it. If there is a problem, I doubt there's anything you can do about it. As long as the flash works and your camera doesn't catch on fire, I think it's probably ok.