According to the smoldering Wikipedia article, flaming combustion occurs in the gaseous phase. I know butane undergoes flaming combustion in a Bunsen burner because it's a gas, but how can wood undergo flaming combustion at all instead of just smouldering? What gas is there to react with oxygen in the flames? Does it smoulder to create carbon monoxide then the carbon monoxide undergoes flaming combustion? Can charcoal also undergo flaming combustion? I've never seen a piece of charcoal without wood inside it undergo flaming combustion, only smoldering.
Also, when oil undergoes flaming combustion, is it its vapour that reacts with oxygen to produce a flame?