What to ask, and why
Will an ozone machine damage my condo?
It can. Ozone is hard on rubber seals, some finishes and fabrics, and it doesn't lift residue. Ask any provider up front whether they plan to use one.
The last company painted over it and the smell came back. Why?
Ordinary paint doesn't seal nicotine film. The surfaces needed cleaning first, then an odor-blocking primer under the paint.
Will the smell return when the heat turns on?
It can, if residue is still in the ducts. Ask for the HVAC system to be part of the plan, in writing.
How long will I be out of my condo?
Whole-space treatments can require a stretch away from home. Ask for the timing before you book, and clear it with building management.
Can treatment stop smoke coming from my neighbor?
No. Treatment removes the residue already in your unit. Ongoing drift is a building matter for your HOA: sealing gaps, fixing ventilation or enforcing smoking rules.