John, a 72-year-old grandfather, had been smoking heavily for 24 years and had a

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John, a 72-year-old grandfather, had been smoking heavily for 24 years and had a

John, a 72-year-old grandfather, had been smoking heavily for 24 years and had a persistent cough. A biopsy of his lung tissue revealed considerable amounts of carbon particles. How could this happen considering the natural cleaning mechanism of the respiratory system?

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