O3 (ozone) what will it do to you?

I have an ozone producing air purifier and I have it set reletively low but it is right close to where i sleep I have no other place to put it so it needs to stay there I was just wondering other than asphixia what can too much exposure to ozone do to you. and can it "add up" over time. like 5 oz of poison x will kill you if taken right away but if you take 1 oz (small dose exposure) it will kill you just that it will take 10 or 20 doses

I hope the question is clear enough. PLEASE ONLY RESPOND IF YOU REALLY KNOW WHAT YOU ARE TALKING ABOUT. this is MY LIFE after all.