The general rosewood family, whihc includes a lot of "non-rosewoods" like blackwood and IIRC, cocobolo, seems to be one of the worst offenders, although parts of the mango tree have the same active ingredient as poison ivy, albeit in much lower concentrations. With that said, I knew a guy in Palm Beach who installed teak on high end sportfishing yacths for at least 15 years including all of the fitting work at Viking's South Florida completion center and one morning, he woke up allergic to the stuff and had to sell his business. The only good news is that he sold at the top of the market before the crash. You never know when a wood allergy will finally catch up with you.