Donald Spector received a patent for these in 1985. They looked like small music discs. But instead of producing sound, they released an aromatic vapor when put in the ‘player’.
I don’t see what advantage an aroma disc would have over an incense candle (except, perhaps, for the lack of an open flame). Which, I assume, is why these are no longer around and incense candles are all over the place.
But Spector was successful enough to have his product featured on The Tonight Show with Johnny Carson: