Languages Smaug spoke?

[Inziladun]

Originally Posted by denethorthefirst

For all we know even during the time of the war of the ring the black speech was still the official language of Mordor and in extensive use throughout the country (at least among the bureaucracy and the administration of the country).

Though the Black Speech may have been the 'official' language of Mordor in Sauron's mind (after all, the Ring inscription was written in it), it doesn't seem to have worked out that way in practice.

I don't have my books handy, but I think there's a passage in the ROTK Appendices that discusses the Black Speech and its relative obscurity in the Third Age. I do seem to recall a passage stating that only the Nazgûl really remembered it by the time of the War of the Ring.