I crap rainbows.
My neighbors are smokers who smoke right outside our building, and in front of my townhouse. The condo association tells me that the venting systems are all separate, and the only way my vents are shooting out air that reeks of smoke, is by someone smoking in front of the return, and the air getting sucked in. Does this sound like it could be the case? I'm so sick of the smoke smell, but I'll be so glad if I found the cause and can fix it, and rid my house of it. Thanks!