Blue smoke. No blue smoke; it is black smoke.
I do not think it is a big deal.
It is probably combination of the bad diesel I bought in a provincial town and the auto climate control working full blast for 20 mins with window open (me smoking

).
Black smoke is produced when you have bad diesel in a modern engine and/or there is too rich a mixture. Even Mercs and bmws emit this if you put your foot to the floor from low revs and the turbo is winding up. EGR help with this but do not totally eliminate it.
There is a small possibility that there is a problem with the egr/wasgate; but my guess is it is a combination of poor diesel, and extreme idling. I think the auto aircon controls idle speed as I did notice rev changes.
This morning after the car was cool enough and in the shade I idled it for 5 mins and there was no smoke. I had the aircon on full auto, but window closed so it wasn't on full power. A little puff came out as I accelerated away. Will wait until this tank of fuel gets very low and will then fill with a better diesel.
As for black smoke when accelerating; if it happens regularly, this means either you are not used to a modern a/t or you have a heavy foot
There is no need to put your foot right down (to kickdown) or anywhere near, just to go down one gear. A gentle touch will take it down. Let the engine catch up with the depression of your foot; so make a nice smooth acceleration. Anything else is a waste of fuel will no real acceleration benefit.
Each A/T has different characteristics and I am not 100% at home with this one yet. But my last three cars were 5sp a/ts (one diesel) and I was always in the gear I wanted to be in.
Given time I will master it as will all of us, new to this model.
Happy Driving