Bulletwood made my nose burn the worst of all and Ipe is in second place. Neither are very bad though but I now wear a good, company issued dust mask just to prevent any problems with long term exposure. (We have to get new masks periodically and can take the old one home).
Haven't ever had an allergic reaction to much of anything, even poison ivy. I worked on a railroad gang for a while and everybody else but me was having bad reactions to creosote.
Dennis