What to ask, and why
Will an ozone machine damage my condo?
It can. Ozone can be hard on rubber, some finishes, and fabrics, and it doesn't remove residue, so ask whether a provider plans to use it.
The previous company painted over it and the smell came back. Why?
Regular paint doesn't seal nicotine residue. Surfaces need treatment first, then an odor-blocking primer before paint.
Will the smell return when the heat turns on?
It can if residue remains in the ducts. Ask that the HVAC system be part of the treatment.
How long will I be out of my condo?
Whole-space treatments may require a period away; ask for the timing before scheduling.
Can odor treatment stop smoke coming from my neighbor?
Treatment removes residue in your unit; ongoing drift is a building issue for your HOA, such as sealing gaps or enforcing rules.