Capnomancy (otherwise known as Libanomancy) signifies a method of divination using smoke. This is done by looking at the movements of the smoke after a fire has been made. A thin, straight plume of smoke is thought to indicate a good omen whereas the opposite is thought of large plumes of smoke. If the smoke touches the ground, this is thought to ...
divination by means of smoke
• (n.) Divination by means of the ascent or motion of smoke.
Cap'no·man`cy noun [ Greek ... smoke + mancy : confer French capnomancie .] Divination by means of the ascent or motion of smoke. 
Capnomancy is divination by observation of the ascent of smoke from incense or a sacrifice.
capnomancy, kapnomancy 1. Divination by observing smoke from victims who were sacrificed by fire. 2. Breathing in the smoke of the sacrificial fire and making prophetic evaluations.