Some folks think a pack a day makes them a heavy smoker, whereas others think it has to be more than two packs a day, or three packs a day before its serious - Most of the other people under 40 who Ive come across who had either COPD or emphysema smoked at least two packs a day or more, and many of them like me are unable to
quit smoking, so the fact that you have
quit is tremendous.
Hope your treatment is going well!