Proto-MSA

*ḥilaḳ- - smoke, soot (Kogan 2015:557)

The origin is unknown.

Mehri
ḥīlōḳ - soot, smoke marks on walls and ceiling (ML 178)
Jibbali
ḥelḳ - to give off a smell of burning (JL 110)
Jibbali
ḥálɔ́ḳ - smoke-marks on a ceiling (JL 110)
Soqotri
ḥíľaḳ - smoke (Kogan 2015:485, 557; Naumkin et al. 2013a:74)