A pocketful of crumpled foil wrappers with a leftover plume or two will give you away. You've been into the chocolate. Again. But a Kiss is just a Kiss and well, it's only 25 calories or so. We love our Kisses, so much so that 100 years after Milton S. Hershey turned out the first flat-bottomed chocolate Kiss with the paper plume, we're going through 80 million a day. That's a lot of co-workers to blame. The bite-size chocolate seems innocent enough; it would take 99 to equal a pound of chocolate, and most of us can stop at a...