How should the smoke appear in the exhaust in a kettle charcoal grill
I don't usually pay attention to the color of the smoke. Just don't put anything on the grill/smoker until the charcoal has turned white or gray. This allows them to reach proper temperature as well as burn off and chemicals used to start the fire. If smoking, soak the wood chips or chunks first. They will burn slower and give off smoke longer, which is a good thing for consistent flavoring. A thick white smoke will be given off after first putting on the wood, then slow as the wood burns off. I prefer to keep the smoke less and cook at lower temps for longer periods, as the smoke gets deeper into the meat as opposed to thick on the outside.