Are ozone machines bad for you?

I've been hearing a lot about ozone machines recently, especially in the context of air purifiers and sanitization. But I'm curious, are ozone machines bad for you? I've read conflicting opinions on the internet, with some claiming they're effective in killing bacteria and viruses, while others warn of potential health risks. I'd like to understand the science behind it. Could ozone machines pose a threat to my respiratory health? Are there any long-term effects that I should be aware of? It's important for me to make an informed decision before investing in such a device.