Hi, you do not give a great deal of info about your car, but I will assume that it has done50K miles and is 5 years old.
All combustion engines produce CO2 and Water as part of the Carbon cycle, to produce energy. The same as when you breath out.
When the car is cold ("at start up") this water will show as steam in the exhaust fumes until the exhaust pipe has heated up, the water vapour is then not visible.
Also residual fuel in the exhaust gas will be expelled as the engine usually adds extra fuel to make starting easier at low temperature. On a modern engine the air intake has a heater to preheat the air to assist this process. Excess fuel in the exhaust gas may be coloured Black.
Faults in the cylinder head gasket may allow cooling system water to enter the cylinder bore under cooling system pressure after a journey. When the car is restarted from cold this water will be expelled into the exhaust system, and would be visible as white smoke ( steam) in the exhaust gas at start up. If the cooling system is being topped up on a regular basis, with no other leaks evident, this should be suspected, the smell of antifreeze from the cooling system being detected in this exhaust gas would be a further clue.
Never buy a car without seeing it start from cold, running it till hot and checking for the above. It can be 'disguised' by unscrupulous dealers selling a 'trade in' car through the trade. As on some fairly basic cars the cost is well in excess of £1000.00 (Yes) and count yourself lucky at that. Many other faults can cause smoke at start up, usually engine needs a major service . rebuild.
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