Do you throw litter from your car?

My mom is the only cig smoker I know who does not litter.
I bought her a Zippo portable lighter that seals. I use an Altoids Sour tin (it seals air tight) for my cigars and pipe ash/dottle and cigar butts, even though they are biodegradable. They do not look nice and people don't want them on the ground or in their flower bins.
She used a water bottle with a bit of water in it or one of my Altoid tins before then. Said the water bottle kept her car from smelling because she could seal it, unlike her ash-tray... did not work.