Having rules like that which no one is in any position to enforce is a daft idea. (And I hope there isn't going to be some kind of anti-smoking patrol going round.)

I suppose the smokers (of whom I'm not one) will be lining up with their heads stuck out over the fence, so the smoking is being done outside the camping area.

Or they'll be puffing away regardless, more likely.

Though there's always the electronic cigarette:

"It looks like a cigarette, however there is no tar. It does smoke BUT there is no smoking pollution material. You do not need any matches or lighter for smoking it BUT it lets you enjoy and satisfy those tactile sensations without any risk and dependence on tobacco. It gives you the same feeling of a tobacco cigar or cigarette without suffering any smoking damage. Smoke healthily without any environmental pollution!"

"I can't see any reason why the Electronic Cigarette couldn't be used in Pubs. The ban only covers smoking, not the use of nicotine" - A UK Department of Health spokesperson. I imagine that'd apply to the campsite as well.