Why is a candle flame repelled by magnets? It turns out to be a combination of diamagnetic soot particles and hot gas.
Dr. Faraday on the diamagnetic condition:
On Flame and Gases:
I should have mentioned in the video that the exhaust from a flame will be oxygen-poor, thus also making it more diamagnetic than normal air. Air is a mixture of nitrogen (diamagnetic) and oxygen (paramagnetic). Removing the oxygen will make the resulting gas more diamagnetic.