Nissan Repair: Smoke coming out of hood and air vents when slowing down, nissan sentra, air vents

Question
Calvin, my 2000 Nissan Sentra has been emitting smoke when I slow down from speeds above 40. It has gotten steadily worse for the past 6 weeks or so, and now smoke is also coming out of the air vents into the car. It seems to happen more in the afternoon on warmer days- could it be overheating? I've had the oil changed and all the fluids checked but I don't know what the problem could be.

Answer
Hi Jan -

Can you tell me if this smoke has any smell? It could be a number of things, so I need to get more info.

Is it emitting smoke from the engine, or exhaust?

When was the oil changed?

Please get back to me
Thanks Jan
aloha
calvin