That equates to a pack a day for 50 years, two packs a day for 25 years, etc.
His turned out to be a lung abscess
. He had no symptoms, just a spot on an xray. Back then there were no CT or MRI scans available. They ended up doing a needle biopsy through his chest wall.
He recently had a scare where, after he had a pretty nasty cold, he was coughing up blood. Not a lot, just some bloody mucus when he really coughed hard. He and I were both worried, of course.