Chronic ozone exposure is a big deal.
https://www.lung.org/clean-air/outdoors/what-makes-air-unhealthy/ozone
Ozone reacts with various molecules in the lung to produce free radicals, highly reactive species of atoms/molecules that cause tissue damage.
https://www.sciencedirect.com/science/article/abs/pii/0891584994901724
On the bright side, you’re right about being able to smell it. The permissible exposure limit in the United States is 0.1 ppm (over eight hours) but the concentration most people can detect ranges from 0.01-0.05 ppm.
Sorry, late night me brain forgot to provide the context for my comment! My concern would be occupational usage if it does produce any ozone, especially in the small business sector, which often doesn’t use as much caution around chemical exposure as one might want.
It might also be a non-issue. I have half a mind to build one of these and do some testing.