Are you historically aware of what happened at the beginning of the 20th century and the exchange of populations? All ethinically greeks from Turkey were forced to move to Greece and the same happened for ethnically turks from Greece who were driven to Turkey.

From this population exchange the only parts that were excempted were the western thrace region in Greece and in Turkey, Istanbul and the islands of Imvros and Tenedos (Gokceada and Bozcaada). At these parts, you can still hear greek be spoken, although the greek speaking population nowadays is just a tiny fragment of what it used to be. These people are greek orthodox turkish citizens.

At the Trabzon region mentioned, where romeika is still spoken, the people there are muslim turkish citizens who although they spoke this dialect for generations at home, were excempted from the exchange because of their religion.

At several cities of coastal western Turkey, although not spoken at home anymore, you may still hear greek and greek visitors being addressed in greek by certain Turks, as these were descended from Crete mainly, ethincally turks that spoke greek at home, and were forced to leave with the population exchange.