It's normal for a thin white smoke to come out of the exhaust at initial start up. This is caused from moisture built up in the exhaust burning off. However if there is a continuous flow of thick white smoke it could be a blown head gasket causing coolant to burn.
if its a head gasket, is it normal for the white smoke to smell like strong fumes? does it make the check engine warning ligth lit up in the panel?
If it were a head gasket the smoke would likely smell like maple syrup, the smell of burning coolant. It wouldn't necessarily make the check engine light go on but it could foul the oxygen sensor and cause it to set a code.
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