slynb thank you for your detailed reply. You did not need to correct first reply; it was very obvious what you meant, thanks. Your reply does show the large variances in opinions and what people consider the facts. For those of us not Dr.s, we can align with either side based on the studies done by 'both sides.' For instance the experience surgeon's comments shown above (https://www.jpost.com/health-science/could-wearing-a-mask-for-long-periods-be-detrimental-to-health-628400) is totally opposite your comments.

What I do know is I have gone without afib for over a year; self employed, stay home 99% of the time so little need for a mask, then all of a sudden I wear a mask for the first time for extended period and I get 24 hours of afib and a blood pressure reading that is totally out of line for me. As an engineer, I was taught to look at the evidence, in this case first hand imperical evidence, and make conclusions guided by them. Hense my question here. Thank you for your reply!