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Lousia, the person in the flat below does smoke, but it's not his smoke I can smell. It's not only in the flat that this occurs - it's at work, it's in the car, it's when I visit friends (who don't smoke), it's in the supermarket, it's where ever I go. Although it comes and goes a bit, for the most part, it's constant and this is why it's really starting to get me down.
As for the ghost theory.....I'm not adverse to the idea, in fact the idea of it is almost a comfort (thinking that perhaps a long lost relative is looking out for me is a nice idea), but I don't have any departed loved ones who used to smoke heavily. The only smoker I can think of is someone who died in 2003, but he was my friends partner, so he and I weren't particularly close.
As I sit here and type, in the office, and after a brief trip out to the bank, my nose is tingling as if inhaling secondary smoke.
I've taken to putting a dab of Vicks under my nose to try and mask the smell, but it doesn't really work and it wears off pretty quickly anyway......honestly folks, it's doing my head in!