Smoke from automobiles can come in a variety of forms, each indicating a distinct issue with the vehicle. White smoke is the most common type of smoke seen, often indicating a problem with the engine cooling system. Blue smoke is more likely to be an indication of oil burning, while black smoke often means a problem with the fuel system. Grey smoke, on the other hand, is usually caused by an issue with the turbocharger or exhaust system. Finally, an occasional puff of steam is usually nothing to worry about and is simply the result of condensation forming in the exhaust system.