Thanks, folks. Did not know the big boxes had chunks. Good info.
Wheelz, another embarrassing confession (in addition to running out of hickory)is the fact that I'm nature-impaired. I can't identify one tree from another, especially now that the leaves have fallen.
My sister's boyfriend bought a CS smoker a couple of years ago after seeing mine. I dawned on me that he probably has some chunk wood on hand. As he will coming down from Chicago for Thanksgiving, I called him tonight and asked him to bring a couple of chunks of apple wood. I'll go by one of the big box stores tomorrow to see what I can find.
Again, thanks for the help.