blown headgasket
Water in engine-head gasket most likely.
White smoke normally means you are burning oil.
Sounds like its burning coolant. Perhaps it needs a new head gasket....
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
blue smoke is oil. white smoke is water. black smoke is unburnt fuel
Quality of fuel plays major role in smoke emission
White smoke is a good indication you have a blown head gasket. And/or a cracked head. Did you noticed, when it happened that the engine started running rough? Best i can do with little info.
condensation
White smoke is usually vaporized coolant. You may have a blown gasket or a crack somewhere.