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libanomancy

n. divination by interpreting burning incense smoke. Started in Mesopotamia and later travelled to Egypt and Europe. A form of capnomancy.

Wikipedia
Libanomancy

Libanomancy (also known as livanomancy and knissomancy) is a divination primarily through observing and interpreting burning incense smoke, but which may include the way incense ash falls as well. Like most other methods of divination, during libanomancy a specific question must be asked. The incense smoke provides an answer, but the smoke must be interpreted by a diviner. Libanomancy may be considered a pseudoscience.