What is Backflow Incense Cones?

The “backflow” or “down flow” incense cone is something fairly new in the market.  Not like a traditional cone, a backflow cone not only sends a stream of smoke into the air but it also sends a flow of smoke downwards.  While used with a special burner the smoke flows downward like fog or water.  There are backflow burners that seem like a flow...
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