Thanks, ladies for the help.
I checked the Household Info website, and it gives the MSDS for the lemon oil I used. It does say harmful or fatal if swallowed. The question is, rather than ingesting it directly in a semi-large amount, is the miniscule amount that seeped through to the interior of the cup enough to be harmful... Probably should just play it safe and not use the guampas anymore?



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Customer service flipped when I called and asked them... So, the answer is:We do not recommend you drink out of them. That's too bad, as they are very pretty. They will still be pretty as they sit on the mantle over the fireplace. Thankfully there is one I didn't ruin. 