I am not a doctor, I work in a healthfood store, and i can tell you from personal experience of having to wear a mask for 8 STRAIGHT hours a day (while stocking shelves, answering phones, helping customers, moving around in a fast pace work environment for 8 hours) has put a noticeable damper on my own immunity. I have had to leave work early now several times over the last month because of dizziness and feeling like i am going to faint. Now, i do not wear a mask if i do not need to, and try to avoid… Read more »