Smoking In Your Vehicle

[Volusianator]

I love to smoke in my truck, on the way to/from work, road trips, whatever. One thing I notice though is that cigars never burn as well when I'm driving. I've tried every setting I can think of on my heater/air conditioner, but I think there's some kind of airflow that just makes my cigars burn poorly in the truck. The only way I can describe it is that the ash gets like "petrified" while I'm in the truck, meaning the center gets really hard, kind of like the middle of an old Butterfinger candy bar. Instead of the ash coming off straight across as it usually does inside, it comes off in a cone shape. Anybody else have this, or better yet figured out a cure?