White smoke is generally water/anti-freeze being burned. That generally means a blown head gasket, or at least one that is leaking water into the combustion chamber. Keep checking your water level in your radiator when the car is cold to make sure the level stays the same. Also check to see if there is any oil slick in the water. If in doubt, perform a compression check.
Look at the inside of your oil cap. If it has a milky looking substance collected there during the summer on a hot day, then the engine is leaking water into the oil. During the winter, that could just be condensation.
If the smoke is a thick white smoke it could be transmission fluid being pulled up through a vacuum line to the intake manifold and being burned, this was quite common on older Ford and Chrysler vehicles that had a vacuum shift solenoid and an automatic transmission. Keep checking your automatic transmission fluid.
