He made his show special. Replacements never measured up. Sorry to hear of his apparently sudden demise. If of natural causes, I agree that decades of chain-smoking likely had something to do with it.
Doctor recently told me that smoking is very much associated with risk of sudden death. (I don’t smoke). Art Bell had a great voice and persona. Scared me one night he took a call from an old lady who described an encounter with a sasquatch when she was a little girl.