both my mom and dad use to smoke alot (mom smokes 1 1/2 packs dad smokes 2 1/2 packs), my mom quit with something called wellbutran ... it worked realy well and she quit cold turke and hasnt smoked in 6 years but my dad refuses to quit and still smokes a ridiculas amount ofcgs a day. if your dad doesnt want to quit you arent going to make him, i suggest you dont buy him cigs next time he asks you but instead offer him something to stop withdrawel such as welbutran or maybe something else you have heard good stuff about