In 1923, after the population exchange between Greece and Turkey, many ethnic Greeks from Asia Minor fled to Greece as a result of the Greco-Turkish War. They settled in poor neighborhoods in Piraeus, Thessaloniki, and Athens. Many of these immigrants were highly educated, such as songwriter Vangelis Papazoglou, and Panagiotis Toundas, composer and leader of Odeon Records' Greek subsidiary, who are traditionally considered as the founders of the Smyrna School of Rebetiko. Another tradition from Smyrna that came along with the Greek refugees was the "tekés" (τεκές) 'opium den', or hashish dens. Groups of men would sit in a circle, smoke hashish from a hookah, and improvise music of various kinds.