stop cigarette smoke coming through vents how to prevent from Home Energy Efficiency and Keeping Cigarette Smoke smoking into the air vents

smoking into the air vents : r UBC Smoke keeps coming into my unit. Please, does anyone know what I can put inside my door to keep the smells out? I can't stand cigarettes or the smell of weed, and how to stop cigarette smoke from coming through vents How to Stop Secondhand Smoke Coming Into Weed smell coming through my vents, the apartment says nothing is connected. In the hallway I cannot smell it, only in my apartment. I've replaced the filter and cleaned, used air freshener

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