What is the best way to get rid of cigarette smoke from an adjacent apartment?
I purchased a 2nd-story townhome and, only after moving in, I discovered cigarette smoke coming in through the framework from the downstairs neighbor. Outside of de/re-construction of the building to improve insulation or stand-alone air purifiers, I've had difficulty finding an effective solution for managing my indoor air quality. RGF's Microcon Whole-Home HEPA filter (https://www.rgf.com/products/air/microcon-350/) appears to be the best option based on my research. Thoughts?