Have you definitely cleaned it enough?
You don't want to paint over smoke.
We had to do a few washes of walls with sugar soap and bleach and bicarb all the windows
Yes, we had to do every surface of the entire house, including other cupboards and enclosed areas, this is the one remaining spot.
Sounds like you have few options left other than actually ripping all the affected surfaces physically out. Plaster off back to brick, chop out any affected timber, basically anything that the old fag smoke would have come into contact with.
@RodSaetan started
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Have you definitely cleaned it enough?
You don't want to paint over smoke.
We had to do a few washes of walls with sugar soap and bleach and bicarb all the windows