You are considered to be having Abnormal Exhaust Smoke if it’s not the odorless, colorless smoke you see, after the engine warms up.
There are 3 common colors of smoke, that indicate problems with your vehicle, and require immediate attention. Also, some colors are worse that others.
Blue Smoke: This typically occurs when engine oil, is being burned, in the combustion chamber.
Black Smoke: Black exhaust smoke usually occurs when, there is incomplete combustion of your fuel/air mixture.
White Smoke: The presence of engine coolant in the combustion chamber.
So, the first step is confirming the color, of the Abnormal Exhaust Smoke.