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In cold weather, it's normal for engines to emit a white, vapor-like smoke due to condensation in the exhaust system. As the engine and exhaust warm up, this vapor can condense and then evaporate, especially noticeable in cold temperatures. However, continuous smoke or smoke that isn't white may indicate a more serious issue. Blue smoke suggests oil burning, while white smoke that doesn't dissipate could point to coolant leaks and a potential head gasket problem. Black smoke indicates excessive fuel burning, possibly due to a faulty injector or air intake issues. It's crucial to monitor the smoke's color and persistence. Occasional white vapor is typical in cold conditions, but persistent or colored smoke warrants a professional inspection to prevent potential engine damage.