I've been leaving three Washington cobs in my beater Tahoe that has to stay outside all the time. The super high temps inside it from sitting in the sun all closed up have caused the stems to be so loose they will just fall out of the shank. They were sitting on the passenger seat in direct sunlight for at least a month or more, so I'm going to stick a couple more inside the console to see how they hold up. Might have to go back to briars (stored in the console) for smoking and driving.