No, he smokes but his kids don't. And they don't like him smoking, so he runs the risk of having them tell his secret.

I would think in this case, discretion would be advised. You should hide the fact that you smoke from your kids, and especially from their friends. Don't think for one minute that they aren't telling other people, like their parents, that you smoke. It'll come back to haunt you very soon if you keep being so open about it.

Onward!