Is this "Binge Smoking??"?

All day long I have no desire for a cigarette, none at all. Then I get home and relax with my first one of the day, usually at around 8 PM. Then I have dinner, then another cig. Next thing I know, I am chain smoking. I can puff away at 10 or so in a couple of hours, then go to bed. Next morning, same thing, no craving for a cig all day long! What is this?