Capnomancy

Smoke that rises straight up to the heavens is interpreted as being a favourable omen for the practitioner. However, smoke that hung close to the altar is seen as not so favourable. And if it touched the earth, it is believed to be a warning from the spirits or the Gods that a new direction or course of action in life must be taken at once. [Source:Gerina Dunwich - Herbal Magick]