Lately I've been having a constant stale cigarette smell in my nose. I don't smoke (never have). When I drop my wife off at work and pick her up, there are usually some smokers near the curb, and plenty of butts on the street. I also work part-time next to a smoker, who's been reeking since the weather got cold. In fact, this is when the problem started, once the temperatures dropped. Even when I'm working all day at home, with the windows sealed tight, I can smell it, and I hate it. What gives?