@MedeaVanamonde in their apartment - I believe they leave their windows open in their West facing unit, thinking it'll just go outside, with little understanding of airflow and the predominant onshore flow here in SD...

I exist with my windows open, and I have East facing windows, so it just blows down the hall, through my doorframe, and my unit

I can always tell when someone is burning a scented candle as well, but I've not much recourse in this arena, unfortunatley!