O from a Kool customer (5)
I believe the answer is:
smoke
(Other definitions for smoke that I've seen before include "Use cigarettes" , "Product of combustion" , "Carbon vapour" , "Fumigate; cigarette" , "Emit fumes" .)
I believe the answer is:
smoke
(Other definitions for smoke that I've seen before include "Use cigarettes" , "Product of combustion" , "Carbon vapour" , "Fumigate; cigarette" , "Emit fumes" .)