Well, I must admit to sympathising with Doddsredoubt. I would hate it if cigarette smoke was drifting into our front room, but I'm afraid there is not a lot you can do really, except for keep your patio doors shut. Not very helpful is it. I must admit if I was a smoker, I probably wouldn't want to go down to the bottom of my garden if I had a cigarette.
It's not pleasant but there is bound to be something with most neighbours that interferes with the enjoyment of our properties, unless we live with no neighbours at all.
They have, at least, tried to be helpful by pulling their table further from you. But what else can they really do?