capno-, capn-, capnod-
(Greek: smoke; vapor; sooty [extended meaning is carbon dioxide])
More related smoke words are at this fumi- unit.
Inter-related cross references, directly or indirectly, involving word units dealing with "smoke, smoking": atmido-; Capnomania & Fumimania, Pt. 1; Capnophobia & Fumiphobia, Pt. 1; fumi-; nebula-; typho-.