dudes, I tried to tum the ozone right and I managed to avoid most of the sickness, lol, it is bad, but it turned out lo levels were sneaking back into the grow thru a draft and were corrupting my plants! Low yeilds and splothcy leaves. Not worth it. Buy the way for cigs it takes like a half hour or so after for the smoke to clean. Like I would smoke in the room then close the doors and leave the ozone on and in a half hour to an hour one cigarette would be gone completely.