Kilz the walls and ceiling and repaint, place a strong odor neutralizer in an open bowl in the central air return. i don't remember what brand i used, but I can probably find out if you need me to...... or you can go to a H&A company and ask them. I flipped a house a few years ago that the lady that had lived there had smoked in for several years. Worst I have ever seen. I replaced the floor coverings as well. Fumigation is another option.
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