I think it's much safer to vape in the car than to smoke. I just wouldn't attempt to drip in the car lol
When you smoke, you have to find your smokes, find your lighter, light the cigarette, not to mention, if you have your windows open, you might need to shield from the wind and will need two hands to light, I'm sure most of us have done the drive-with-your-forearms-while-lighting-a-cig move. I now use my eRoll in the car, so I make sure my cartridge is full before I leave, and then all I do while drive is grab my eRoll case from the door handle pocket, pull out the eRoll, and I'm ready to go. Less to get together, less fumbling, and no hot cigarette to drop and burn myself or my seat.