Thank you! Those are good suggestions. I'll get rid of my lighters :)
Its a bit of a routine. Get up, have a cigarette, get to train station, get off train, get off bus etc.
I know that medically, smoking doesn't help stress, it actually raises your blood pressure. So the logical thinking might help. Also, after 3 days, the physical addiction is gone and its purely psychological, so that thought could help too!