I agree very much with the addiction aspect being genetic. My mother has tried to quit cigarettes umpteen times and never been successful. Smokes multiple packs a day.

My dad has smoked here and there my whole life but mostly in the summer. He'll go all 6 months of winter (Minnesota) without smoking not wanting to be in the cold and not wanting to smoke in the house.

He never "needs" a smoke, unlike my mother. It's always "oh a smoke would be nice on this beautiful night".

I like to smoke a tobacco pipe and do so about 6-10 times a year. I think I got my dad's side of it