As a carpenter, I physicaly exert my self and lungs for the large part of the day. I find that I (and co-workers) am/are spitting through out the day. An uncle of mine thinks that this is normal with physical activity. When I'm out on the town, I don't have the need to spit as much. When I do, I'm conscious of depositing the phlegm into the soil of a planter or in the gutter, out of sight, out of mind.
I think it would be detrimental to the growing heath problem of obeisety, to start fineing joggers for clearing out their lungs while exercising, unless they are the pigs doing it on the sidewalk/windows/signs/bus shelters/ news paper boxes, etc.
*the above is just my opinion*
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