1. Condensation: In cold weather, it is normal to see white smoke or steam coming from your exhaust. This is simply water vapor condensing in the cold air. It should disappear once the engine warms up.
2. Coolant Leak: If you have a coolant leak, it is possible for coolant to enter the combustion chamber and burn off, creating white smoke. Check your coolant levels and radiator for any signs of leaks.
3. Oil Leak: If you have an oil leak, it is possible for oil to enter the combustion chamber and burn off, creating white smoke. Check your oil levels and engine for any signs of oil leaks.
4. Blown Head Gasket: A blown head gasket can also cause white smoke, as it allows coolant to enter the combustion chamber and burn off. However, a blown head gasket will typically also cause other symptoms, such as overheating, engine misfires, and rough idling.
If you are concerned about the white smoke coming from your car's exhaust, it is best to have it checked out by a professional mechanic. They can diagnose the problem and determine the best course of action.