I know this doesn't prove anything, but the hand on the left has been in a zip lock bag in my car for three weeks and the hand on the right was stored in a cardboard box in my closet. They are both Thompson Maryland tobacco from the same crop, harvested at about the same time and from the same position on the plant. The darker hand has a richer tobacco smell, the lighter one still smells fresh and green. I'm pretty certain that the temperature in my car is not reaching anywhere near 160 degrees, but I will try to get a temperature reading this afternoon during the hottest part of the day. My vehicle is silver colored, if it was dark colored, I'm sure it would get hotter. Also, I am not putting the tobacco on the dash, that would increase the solar heating effect quite a bit, mine is stored out of direct sunlight on the seat or floor of the car. As I've stated before, if I had a kiln, I would definitely use it instead of a car. However, my carpentry and electrical skills are not such that I want to attempt to build a kiln. In other words, use this method at your own risk and monitor it closely.