Kabs,
I'm a 'what iffer' but if I were you and wanted to stay with my friends I'd skip the what ifs and book it, Danno.
There's no guarantee there will be dump fires during your stay, although given the dumps track record there is the likelihood there might be, but there's no certainty of the direction of the winds ergo the acrid odors.
We stay in the Mullet/Cupecoy area and we smelled it all the way over there for a few days on one of our trips but the fire had been burning the whole week before and we hadn't known it until that morning.
If you're truly concerned from a health standpoint you might want to bring a surgical mask or else pick another island. Not trying to be facetious but there's just no way to know..... <img src="http://www.traveltalkonline.com/forums/images/graemlins/handshake.gif" alt="" /> <img src="http://www.traveltalkonline.com/forums/images/graemlins/handshake.gif" alt="" />