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You did not mention what kind of car it is. However, what kind of smoke ? If it is blue(oil), it could be that the car is one with fairly "low tension" piston rings, which can quickly become ruined in a situation of severe overheating.

If it is white smoke, you still have an internal coolant leak of some kind that is causing anti-freeze to enter the combustion chambers.

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Q: Ive had headgasket replaced now being told its blowing smoke from the exhaust which it wasnt doing before what could course this how to fix.?
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