I agree it would not be pleasant to be down wind of that. As many times as I have been the line of smoke, I can honestly say I've never even felt nautious from it, much less sick. I am curious though, what do you normally get from it? Flu? a cold? worse? How many days of work do you normally miss because of being sick from it?
Another fun thing that you do if he doesn't respect your request after you talk to him. Devise/engineer your own ultimate smoke system, wait till the wind is blowing toward his house, and see if you can turn it black. Or even simply fill a big barrel with some compost, put a lid on it, and every time the wind is going his way take the lid off.
Lots of things you can do to have fun with it rather than acting like a young child and telling on him.