do not ever breathe ozone or have a device in the home running all the time where you would breathe it. it is great to ozone an entire home while your not in it, but not while you are in it.
drinking ozone water can be used as a therapy and i don't suggest anyone do it until they have read in a book why and how to do it.
ozone is great to clean your vegetables/fruits in the kitchen sink, that is mostly what i use it for. also great in the swimming pool / hot tub.
people have went to jail for selling ozone machines for cancer therapy.