I'd set up a temporary kitchen downwind of them, start cooking all kinds of wonderful foods, strategically place a few large fans to waft the cooking odors in their direction...then eat the food I cooked in front of them.
This is probably a human rights violation :-))
I know what you mean ('upwind', right?).
My neighbor is doing the Atkins thing, and the barbecue is going almost every day, between our houses. It's making me crazy.