Usually white smoke all the time indicates a leaking head gasket (leaking coolant in the cylinders), which should be fixed right away because piston rod bearings and crankshaft bearings really don't like antifreeze... Can cause serious engine damage.
In rare cases, white smoke only at cold startup (stops right after startup) is an indication of too much fuel in the combustion chamber
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Usually white smoke all the time indicates a leaking head gasket (leaking coolant in the cylinders), which should be fixed right away because piston rod bearings and crankshaft bearings really don't like antifreeze... Can cause serious engine damage.
In rare cases, white smoke only at cold startup (stops right after startup) is an indication of too much fuel in the combustion chamber