Stop breathing so hard in your car!
I rarely run the a/c in the winter or defrost. I keep the inside of my windows free of haze by wiping them once a month with Invisible Glass cleaner. I've driven loaners cars that has the fogging problem but mostly it was due to light haze already existing on the window.
'10 Mercedes C63 AMG
'09 E90 335i Fully Loaded-Sold