Yes, it is true. I support a smoking ban in all public buildings. Public buildings are, by definition, publicly owned. As such, the rules within those buildings should be detirmined by the public, through the legislative process. So long as smoking bans in public buildings pass constitutional muster, I am all for them. I see no reason why I must be compelled by our government to participate in a jury, for example, while also being forced to inhale cigarette smoke.
Some examples of public buildings would be public schools, courthouses, city hall, public park buildings, jails and libraries, to name a few.
Buildings that are privately owned would naturally be exempted from the public legislative process. These would of course include privately owned bars and restaurants.