most exotic hardwoods are toxic, all wood dust is at least an allergen and bad for the lungs rosewood, cocobolo, yew, purple heart, ipe are some of the toxic ones i have worked with. i once read something about ipe and purple heart in reference to it being used for decking it went something like this: "There is a reason why bug don't eat it and moss doesn't grow on it, and its not because its pretty...." Even "non toxic" woods like Maple will do a number on your lungs if you breath the fine dust. take toxic wood precautions always and your lungs will thank you in the long run. when i first cut coco i didn't use anything, my sinuses started pouring snot and i got sick to my stomach, plus i got it in my gloves once and it caused a rash on the back of my hands that eventually started bleeding. no problems since i started wearing good gloves, a respirator and using a shop vac dust collector w/hepa filter.