You most likely overfilled with too much oil. That burning smell is your burning oil.
White smoke can be indicative of many things depending of where it is emitting from, but the fact that this only happened after your recent oil change almost certainly points to overfilling.
burning oil
Burning oil
Burning oil
from smoke from car, train exhaust, smoke from refuse burning
Black smoke means you're burning fuel, blue smoke, you're burning oil, white smoke, you're burning coolant.
Find and fix exhaust leak
It all depends if the car is running lean or rich, if its burning oil, if its burning coolant. a clean running car doesn't really have a strong smell. By the way, exhaust fumes are toxic. It contains carbon monoxide and it is highly toxic. So don't go around smelling car smoke.
smoke, bubblegum, and your mom
You can tell this before an oil change. If you see blue smoke coming out the exhaust your engine is burning oil. If you're oil level is low and you have no oil leak your burning oil.
Sounds like a bad head gasket allowing coolant to pass.
What color is the smoke? Black - running rich. Bluish - buring oil. White - burning coolant. When you smell the gas, it is inside or outside the minivan? Back of the car or near the front?
It would depend on what is burning.