Jean you need to have something else like to keep you from lighting up in the car.
I'd suggest something that would take you most of your trip home to eat or drink.
Concentrate on the item and enjoy each thing you like about it.
For instance let's say it's carrots.
Think first of the pretty orange color, nice texture, crunchy, taste how much you have to chew it.
Anything to keep you from thinking of cigs.