do not use an ozone generator in your grow space, it will cause damage to your foliage and may significantly reduce yeilds.
ionizers and ozone generators are not the same thing.
Ozone generators produce O3, the third O molecule is unstably attached to the 02 and easily attaches to airbone molecules, especially smoke and odor
Ionic generators produce negative ions in the air which some believe help the plants breathe better as to the point in having an ion generator in your home is to have cleaning air that is easier to breathe and allergen free. This is why people think it helps the plants.
I personally have an ion generating fan and i love it, it doesn't reduce odor in my grow room but it does seem to help. ( i know its not hurting)