Sounds like the starting of a bad head gasket. Keep the coolant level up for now.
If the outside temperatures are warm and your exhaust smoke is still white, you've got a problem. This means that coolant has somehow leaked into the combustion chamber. This could be caused by a few things, such as a blown head gasket, cracked engine block, or cracked cylinder head... If it's only on start up in the morning and not a massive amount it's likely just slight moisture... also check your PCV system..worst case scenario could be valve seals, Valve seals may be gone. Oil tends to leak by the seal while it sits. This oil is burned off on start up
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