I'm getting the same, sometimes worse than other timeswhen the engine is cold. I noticed that when I get the smoke, the engine seems to run rough, but only for about 20-30 secs. I feel that it is just the ECU giving a rich mixture. It does smell diesel, not Oil or Sweet (antifreeze) smell.

I have read that a clogged/dirty air filter wont help with the cold starts, so I am going to change the air filter in the next few weeks, as mine has done nearly 90000km on the original.