The other day I was sitting in the car with the heat on and noticed an oil smell and smoke coming from the vents. I drove the car home from work with the heat off and it rode fine. Any clue what this could be?

 

The smoke from the vent may mostly come from the VCG which is leakin then hot oil drop in the metal underneath the engine and fume. Because you turn the vent on or the heat on, it just absorbed the air that surround the whole engine underneath the hood.

Check you VCG valve cover gasket.

Good luck