Just wondering, have you possibly mentioned to the neighbor how sick the smoke is making you? Might he be encouraged not to smoke if he knew how sick it makes you? Maybe a long shot but just wondering.
If everyone thinks alike, then someone isn't thinking.
Everyone knows something, together we could know everything.
If you're replacing the VOG all the time, it may be worth while finding a safety supply store and getting a 1/2 mask respirator with a good filter/cartridge combo. The cartridges should be cheaper (unless the pricing in your area is a lot different) and the protection / filtering should be higher than the VOG.
Plus, if your neighbour sees you with some serious protection on, they may take your concerns a little more seriously.