I was also told by a scientist who went for a ride in my car that there are gases released from some of the materials used in plastics of interior car parts - including the dashboard - which will also create a film on car windows. Doesn't make me feel any better, really, but at least I know my ecigs are likely not the culprit, now, as I don't vape a lot in the car. I do vape at work and no film on the computer screen, thus far.