Charcoal barbecues burns solid fuel to provide the heat which cooks the food. During this burning, smoke is emitted which also imparts a flavor to the food, depending on the type of fuel used. Gas barbecues burn gas to provide heat which cooks the food. There is no appreciable smoke which is produced from burning gas, but there is some smoke which results from fats and juices from the food dropping onto the flame diffusers, and this may impart some flavor onto the food surface.