If it's a blue-ish grey smoke that typically means a small amount of burning oil. Also being that it's colder outside it may just seem like more smoke than usual, you know, exhaust-hot. you catch my drift. Just to be on the safe side I would closely monitor my oil during the next change and see if your burning a significant amount ie: more than a half a quart(with spirited driving If that's the case), I would also check it every couple of days to monitor usage and condition, and also i would take a close look as I was draining the oil to see if it appears darker/blacker than usual. Your car is pushing 15 yrs. old now so It's possible it may burn a little oil. I have had older vehicles that burned a bit of oil when driving hard, that were not desperately in need of service. But definitely keep an eye on it. Hope all is well.