[Modernman]

Of course they can. All they have to do is pass a rule, like the ones you claim are just fine on other issues.

Nope- a school board doesn't have the legal power to pass such rules. Unless they've been given such powers by the state government. The state could raise the smoking age for students still in school or whatnot. However, I'm not sure how a school board could argue that its powers extend outside of school property. It would be like the school board trying to pass zoning laws.

[Protagoras]

It is in perfect keeping with your opinion on no smoking rules.

Here's your shovel.