My worms have eaten jalepeno, tabasco and habanero peppers. I have heard that the hot oil in the peppers only effect mammals.

you can always try one and see what the worms do with it. That is what I say to most things, try it sparingly at first, if the worms avoid it, then they may not like it. Some things just take a lot longer to start to beak down, like peanuts in the shell for instance.