Question: A March 2010 headline from esciencenews com said Exposure to tobacco

A March 2010 headline from said, "Exposure to tobacco smoke in childhood home associated with early emphysema in adulthood."
a. Is this headline more likely to refer to a controlled experiment or to an observational study? Explain.
b. Suggest a potential factor that might explain the association between childhood exposure to smoking and early emphysema.

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  • CreatedJuly 16, 2015
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