They may help (a little).
If you're talking about a house that had chain smokers for 20 yrs,
you must remove the source(s), which means scrubbing/sealing/
every possible surface. Carpets/drapes too.
And don't plan on occupying the house while the ozone machine
is doing its job; the ozone is highly toxic in the concentrations
needed for any remediation.
Ozone generators are not recomended by the EPA and American lung assn
for residential use If they output more than 50 ppb. that is an 8 hr
Most Generators for commercial use easily exceed that, as do many
residential units. Ozone is not your friend. Google Ozone generators
and learn. The public is unaware, and sellers of units are just in the
business for money. Even consumer reports goes into ozone on their Air
And along with Jims post, don't be so stupid as one customer of mine who left
animals and fish in the home!!! Ozone will turn a fish tank into H2O2 (Hydrogen
if the concentrations are large enough.
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