Guest guest Posted April 3, 2011 Report Share Posted April 3, 2011 American Society for Microbiology (2009, October 26). Cigarette Smoke May Impair Lungs Natural Defense Against Harmful Pathogen. ScienceDaily. Retrieved April 3, 2011, from http://www.sciencedaily.com/releases/2009/10/091025200317.htm Quote Link to comment Share on other sites More sharing options...
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