I believe masks help, but even N95 masks are certainly not 100% effective:
>>>The next day I got a call that I had also tested positive for Covid-19. I should have expected that news, because the night before I had lit a pumpkin-scented candle but didn’t realize until later that I hadn’t smelled its fragrance.
I was angry, and still am, that the response to a worldwide pandemic has become so deeply politicized in the U.S. and that even though I took every precaution, it still wasn’t enough. I began taking nebulizer treatments four times a day to keep my lungs clear and began taking zinc and vitamin D.<<<
During the time when I felt the worst, anxiety compounded my physical symptoms. I wondered every time I fell asleep if I would wake up wheezing or unable to breathe.
www.statnews.com