I would be very POed if smoke was wafteing into my house, I do have a BF who smokes which he does it outside when im with him. I see how it would bother both sides. I would go out and get those fans that can either suck in cool air or suck out hot air from the house. We have plently because the A/C can rack up bills. They are also useful for keeping the fire smoke out when we have a small fire and gathering out behind the house. I would try those kinds of fans (they are super cheap and we find them at Olies stores here in PA). If they are not doing the job (which they should if your NOT useing the one in the house) then I would politely ask the neighbors to use the other side of the house to smoke. And if all else fails deal with the heat or move.
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