Our neighborhood group got ozone machines from Sunbelt, I used one for two weeks to rid my basement of the smell after floods.

If it’s not too strong, consider using various ozium products. Also remember to pay attention to your HVAC if that’s relevant. Learned that the hard way…

You're going to need to treat the walls, ceiling and floor as well. otherwise it'll start to come back over time.

Even with Ozone?

What do you mean HVAC you mean make sure it’s running through vents?

Yes it'll get rid of the smell temporarily for 6mo or even a year. But tobacco gets into the pores of everything and the more dense the material, the deeper it seeps into it. So it will eventually start to release again and bring the smell back.

Cigarette smoke can accumulate in the filters and vents. Simply saying that you will want to consider that in your treatment plan as well. If you end up with an ozone machine, consider running the HVAC as well during treatment and changing the filters.

Yeah you may need to repaint everything starting with an odor-treating/sealing primer coat. Really depends on how bad it is.

Yeah my HVAC guy came to service and he smelled a little smoke. He took out the HVAC filter and noticed it was yellow. He was like “yeah they’re smoking in the house…”

What do you recommend? Like encapsulating paint?

Yes.