Nothing to worry about it's just stuff burning off the exhaust system. Some can also come up through the engine / trunk cover louvers. Drive it for awhile on the highway and it will be done with in like 10-15 minutes. We are talking about a very minor amount of smoke, generally noticed when stopped and idling after first driving the car enough to build some heat.
But it can sure catch your attention!
It might be a good idea for the dealers to advise new owners about this before they drive off. If you drive straight home on the highway you will never even notice it as it will burn off on the way home if the trip has a decent duration. In that case any smoke won't be noticed at speed since there is just not very much of it.
The same things happens again when you have the Stage 2 music maker exhaust installed as I did. That one made some smells too.