There is somebody in my building that smokes very heavily almost every night. One woman, who lives a considerable distance down the hall from our apartment, suffers from allergies, and nobody can figure out where it's coming from (not me, I use a vape).
These joints, blunts, or whatever he or she is smoking must be humongous. It's like they're smoking it right in the hallway, and the smell permeates the apartments on at least two floors, maybe more. It doesn't bother me, but I understand that people that don't want it coming into their apartment.