Lump Charcoal Sparks

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Because lump charcoal isn't always thoroughly carbonized, it can spark and smoke. The sparks are, of course a fire hazard, and the smoke tastes nice, but you don't know what wood it is and you can't control how much. These are among the reasons I prefer charcoal briquets. And by the way, this is a brand of lump highly regarded by enthusiasts.