I smoke on the way to and on the way home from work most days.

I've found all these to be quite satisfying:

U S 'd o m e s t i cs'
Famous Beunos Maduritos (sp?)
Rocky Patel Juniors

I S O Ms
Monte Puritos
JLP Cremas (they cheap enough that if you haven't finished in time you can just toss 'em).
RASCC (sometimes these last longer than the drive, so I sit in the car and savour them - I'm not tossing any of these babies!)