How does odors and smoke travel from an upstairs apt to downstairs?

Question

I live in a downstairs apt. Delicious food odors travel down into my apt. Cigarette odor and weed odors also come down. It all comes through my air conditioner furnace in my apt and come through the vents. It stinks my apt up. Maintenance has checked for holes in the floor, but can't find how it is getting into my apt. Been here 5 years. This just started about a year ago. I am a cancer survivor. Don't need the smoke.

Answer 1

get one of those ozone air filter things.

Answer 2

Smoke is heavier than air.

Answer 3

diffusion