The thing is we were in the smoking area, so they were technically within their rights to smoke (I'd normally go in the non-smoking section but there were no tables free). It was just very annoying as we had shown them consideration while they were eating, but they obviously felt there was no need to return the courtesy.

On the flip side I've also had a guy come up to me in a cafe and ask if I minded if he smoked, even though I was sitting in the smoking section, which I thought was really nice.