The body uses the respiratory system to excrete toxins. Those toxins build up in the masks and then you breathe them in again. It also inhibits the outflow of toxins, which then puts the overload onto your kidneys. This is why the use of Remdesivir with respiratory infections is so harmful, because Remdesivir fucks up the kidneys. What we're witnessing is a massive scam to kill and make people sick, and ultimately dependent upon the pharmaceutical industry for the rest of their lives. Sinister shit.