The Proto-Kartvelian word ḳwam-
Word ḳwam-
Meaning smoke

Comments
Heinz Fähnrich, Surab Sardshweladse: Etymologisches Woerterbuch der Kartwel-Sprachen, 1995 Brill

Other words that might be of interest
mz1e ‘sun’, ṭwar ‘to light up, kindle’