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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.
What "super strong" thing did you have in mind?