I actually crack the window when I'm vaping in the car. One, it's a force of habit. Two, if I have passengers, I do it. But when it's -5 like it was today? Hotboxin' all the way to and fro!
I do the same with the windows I rode around with window cracked for so many years it dose not seem right to not have it open as I drive.
IMO this puts the water vapor exhale wives tale to rest. Thats not water vapor hitting the cool windshield and turning in to a film.
True, but the deniers still claim it is off-gassing from new vehicles, pollution, etc.
You can tell your self what ever makes you sleep well at night. We are exhaling VG and PG with a little nic mixed in. Stand in front of a window on a cold day and blow vapor on it for 30 or 40 minutes twice a day for a week or two like when your driving then tell me that film is from rubber boot gas in your vent.The etc is also fumes, dust, whatever from the vents now that the heaters, defoggers are switched on in the colder weather. Ask your "perfect" neighbors how often they clean their windshields, summer vs winter..
How can I clean the inside of my car windows so they won't haze over?
What is That Dirty Film On the Inside of My Windshield? - Smail Auto Blog
Film buildup on interior windows [Archive] - Honda Ridgeline Owners Club Forums
and more of course.
The dashboards, like rubber boots, never stop out gassing when heated up.

i vape Cinnamon in my car and now my windows are starting to crack...![]()
You can tell your self what ever makes you sleep well at night. We are exhaling VG and PG with a little nic mixed in. Stand in front of a window on a cold day and blow vapor on it for 30 or 40 minutes twice a day for a week or two like when your driving then tell me that film is from rubber boot gas in your vent.![]()
I'm pretty sure it is VG, as it is a little greasy. Happened in summer, as well, but not as much, as I had a window down or sunroof popped open most of the time.
If you have ProVaris finding YOU then I want to stand next to you so I can get a few more....lolThe ProVari are defiantly the issue here. It all started when they found me...
My juices are heavy on the PG side, as I don't like the viscosity of heavy VG juices.