When people start getting sick/very uncomfortable from wearing them.
Had to wear one in a greenhouse today. (Had to keep pulling it down anyway) That was two hours ago and I still feel ill. I cannot breathe in greenhouses WITHOUT a mask on.
I’ve only worn a mask a few times since this nightmare started. It was never mandatory though.
Now it’s too hot to wear it. Most people here (LA) wore it for all the “flatten the curve” BS, but now maybe 50% people wearing it. At 90 degrees masks get very old very fast.
Come next month, forget it.