I was topping up my e-cig, and the tiny little rubber seal by the coil pinged off. Girlcat promptly left her supper & pounced on it and I think ate it! 
Luckily she promptly threw up voluminously over the floor, so the chances of her ingesting any nicotine are tiny & even if she did swallow the seal it would only have had a miniscule amount on it in the first place. But I think I'm going to have to go through the vomit (yeuch) to see if I can find the seal, then watch her closely for the next few hours.
She's supposed to be the smart one!