Sound like you might have a blown head gasket. Engine coolant is leaking into the cylinders.
It's possible that the white smoke you are seeing is from coolant entering the exhaust, however, I would think that the engine would also be running rough or be difficult to start should this be the case. I would start by checking the coolant level. If the level is very low then it's possible that you have a head gasket leaking which is allowing coolant to enter a cylinder and then be forced into the exhaust where it will turn into a thick white steamy/smoke that takes a while to dissipate after it exits the tailpipe. Whatever the source or cause of the smoke is, it's possible that it could cause some serious engine damage so you should have it checked out as soon as possible.
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