[Wonder Warthog]

"My glasses fog up when I exhale."

Be sure the mask you use has a "conforming wire" the gives a good tight fit across the nose and cheeks. Also, breath IN through the nose and OUT through the mouth. Greatly reduces both fogging AND CO2 "recycling".

[ken in texas]

- Also, breath IN through the nose ... -

Try that with a deviated septum. You won't last long.