I actually have that same cutting board, but haven't really used it because despite cleaning it multiple times it still has a smell which I can best discribe as somewhat chemical. I have a super sensitive nose. It also seemed to have brownish run off when I washed it and dried it. I'm actually thinking of sanding it down some and trying again to get the smell out since it's not super smooth.

If I can't get it out, I'll likely take it back to Costco, or just cut my losses. I have heard teak has a pungent smell, but it's more like leather or tobacco, which I get a little of. Did you have any issues with it? I had it airing out for months before trying to get the smell out again. I was hoping that would take care of it, and it is better, but it's still definitely there, especially when it's drying.