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I only ask because you either need to neutralise or mask the odour of the stale fags... and neutralising hasn't worked so far.
We had a similar predicament in our old flat for a few months which, when I tell you it was "self-inflicted" by the simple mistake of burning nigella seeds once, means I know that neutralisation simply isn't enough sometimes. We used the air purifiers but also went through a lot of scented candles and air "fresheners" to deal with the problem. Every time we came in from work, it was like walking into an Indian restaurant kitchen. I love Indian food, but it was too much!
So many years of cigarette smoke... yeh you might need to pull out all of the stops and try a few things.
If we weren't selling up, we would have redecorated the kitchen and added something to the paint to mask any remaining odour from the plasterboard.
Giant Haystacks?
I dunno, I was putting it out there and hoped someone may have a specific product they have used in a similar situation.