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White smoke normally means you are burning oil.
oil getting by the rings causes white smoke and oil dripping out of the tailpipe.
white smoke can be either your car overheating, or smoke from an electrical issue
White smoke means head gasket, cracked head or equivelant.
water
blown headgasket
blue smoke is oil. white smoke is water. black smoke is unburnt fuel
Quality of fuel plays major role in smoke emission
smoke
condensation
It's the fuel from the engines.
If you ever see a commercial airliner in flight behind it there will be a white tail folowing it. This is the smoke trail.