by Dr. Paul Craig Roberts
PaulCraigRoberts.org
This 39-minute interview with two experts is the best information available on the efficacy and dangers of masks. As I have reported from the beginning, unless the mask is N95 it provides zero protection against inhalation and exhalation of viruses: https://thehighwire.com/videos/mask-whistleblowers-tell-all/
All masks raise C02 levels, reduce oxygen levels, and, if you are infected, increase the viral load that you are breathing. If a N95 mask has an exhalation valve, the C02 and contaminant levels are lower, but if you are infected the mask does not protect others from your exhalation of the virus: https://multimedia.3m.com/mws/media/1794572O/surgical-n95-vs-standard-n95-which-to-consider.pdf