for the smoke i had taken a clothes hangar and cut it, and then cotton balls and stretched them out along the rod, then hairspray to kinda keep it together, then black spray paint , then glue to attach it to the plane itself,
Now as for the weathering effect and being all dirty , i took a metal can and stuck it over a burning candle to where it had accumulated that smut on the bottom, then a paint brush to apply that smut from the can to the plane like a powder coat, all dry of course.