2002 BMW 330 Excessive White Smoke Upon Starting

I will make the assumption that this is something you have just noticed and it has not done this at all in the past. Does the smoke have a sweet aroma to it? Has the engine EVER been over heated? Is the cooling system nominal, has it ever been apart for cooling system repairs or replacement of components? Is the cooling system losing coolant? Is there contamination in the oil from coolant? Some steam from condensation in the exhaust system is normal, I will assume this goes beyond what you consider normal. A head gasket that is compromised will exhibit these symptoms as you have described and it is possible the cylinder head casting is cracked as well if the engine was overheated. I await your response. ♥

Pressure testing the cooling system and leaving it sit with pressure on the system overnight with the spark plugs out to see if coolant goes in the cylinders might be the thing to do. ♥

The damage may already be done and I would say driving the car should be okay, but I will let you make that decision.