Title: John, a 72-year-old grandfather, had been smoking heavily for 24 years and had a Post by: barry on Apr 6, 2012 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?
Title: Re: John, a 72-year-old grandfather, had been smoking heavily for 24 years and had a Post by: biology101 on Apr 11, 2012 Content hidden
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