No more smoke on startup, what's going on~

[Maxodus]

I used to get a puff of smoke from the vent behind the passenger door, if I leave the car sitting for a week or two and start it up. Somehow I haven't been seeing this recently. Just curious if that tells me something about the health of the car (or where it is trending). Or i'm just thinking too much! (well i'm due for my oil change this month).