Well,
My parents know a couple who own a chocolate factory in Northern California, and they add some chili peppers to some of their dark chocolate candies.
On the other hand, my ex-client hasn't done this yet, at least not that i'm aware of. They have about 70 different recipes for chocolate covered apricots, Aspen Mint Almonds, & create unique recipes for their wholesale customers. I'll have to ask them about that.
L