2000 Hyundai Accent White smoke

Hello, Just bought this car and notice that there was white exhaust smoke and some oil smell.(Private seller) When I test drove it I didn't notice any of these problems. According to the records kept, regular service had been preformed and had passed IM & safety inspections. I have very little car knowleg and of course I'm worried that I may have bought more than I bargained for.
would like your suggestions of what could be wrong and how to talk to a local mechanic.