Or, if the car has been sitting and has had very little use,when driving it more it may stop smoking on it's own. my 79 Chrysler would puff blue/grey when I first got it. After 2 oil changes (about 1500 miles total) and a 2000 mile road trip it cleared up on it's own. I've had several do that from lack of use.Also you may find that the compression may balance out too. Just a thought.