Me, reading the bag while I enjoy some Smooth & Melty Mini Mints: "What is propylene glycol?"
Lovely husband: "Um, why does that sound familiar as some sort of TOXIN?"
According to Wikipedia, it is the main ingredient in deodorant sticks. And it is used to de-ice airplanes.
According to me, it is DELICIOUS.
(And a little worrying, admittedly.)