Bubbling ozone through olive oil simply strips the O3 - Ozone away leaving just stable oxygen. There is no harm in breathing low concentration ozone say from an air purifying unit. The effects of productive coughing is simply a detoxification that is beneficial according to Ed McCabe and also my own personal experience of directing a 350 mg/hr machine 2 feet away from my head all night every night. To me this seems an efficent and passive way of taking O3 - Ozone into the blood the same way O2 is taken into the blood.