[350HP930]

IMHO a dozen cigs a day is a heavy smoker.

I would consider my smoking a problem if I smoked even a pack a month.

Our lungs are designed to fend off a certain amount of particulate pollution and living or working in polluted areas is likened to smoking almost a pack a day. The problem is that if we abuse our bodies with more contamination than they can effectively deal with we will pay for it sooner or later.

Its just like drinking. A shot every now and then is one thing, being a raging alcoholic is another.