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You have a lot of good knowledge here on the site.
With that said, I had a issue sometime ago with rough start smoke for less than minute when starting.
It was a simple glow plug boot on just one of the cylinders not making good contact.
The cold advance is on the back of the right side of the block ( when sitting behind the wheel). Take the doghouse off and you should see it .
While your at it may as well replace the fuel filter if its never been replaced ( Maintenance ).
Some people here add injector clearer to the fuel once...