Yep: white smoke is an issue with many of the engines today that are in perfect mechanical condition. but below are some common issues:
1. Poor fuel quality (low cetane rating).
2. Low inlet air temperature.
3. Low coolant temperature.
4. Low compression ratio.
5. Retarded (incorrect) ignition timing.
6. Incorrect/failed fuel injection components.
You’ve got air feeding the engine that’s being cooled by seawater (after-cooler-if fitted), you’ve got cold engine oil being sprayed at high volumes to the underside of the piston crown slowing it’s heating process, and you’ve got a mechanical fuel delivery system that is designed to be at optimum efficiency at WOT or close to it. Other than the fuel system, it’s the temperature again that is the common denominator.
After every thing else fails,it can be fixed by, increasing start-up temperature by adding block/pan heaters to engines and still offer's many benefits. You’ll still get improved start-up and oil circulation, less moisture build up in the engine room spaces, and a much nicer environment for the engine to live in (warm and cozy) if in colder climates.