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.

The libanomic manuals come from the Old Babylonian period roughly dated 2,000-1,600 B.C. Obviously popular at that time, this method of divination began to decline later, but the knowledge was preserved by trained diviners. From Mesopotamia, libanomancy traveled to Egypt and later became known in Europe.

Libanomic texts mention the possible interpretation of some of the signs. For instance, the Three Collated Libanomancy Texts say that if incense is sprinkled over an open flame and the smoke drifts to the right, you will defeat your enemy. If the smoke clusters, it means financial success. Rising smoke that forms two columns means the loss of one's sanity.

...
Wikipedia