White smoke is traditionally steam, meaning you could haave a cracked head , gasket or cylinder allowing coolant (half water) into combustion chamber.
One way to tell is to run it, put your hand behind the exhaust pipe and in less than minuet, you may have water droplets in the palm of your hand. Probably a better way is have a mechanic do a leak down test.Dosn't require running the motor.
AOS is another fair bet. Read below.
Regards, PK
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