1. Taking an exam

In addition, the authors concluded that: thirdhand smoke exposure among children causes "multiple short-term and longer health problems, many of which maynot manifest fully until later in life."

This argument is fallacious, I believe, because there are many things that changed from one cohort to the next. The introduction of cigarette filters is only one such change. To assume that any observed changes in cancer risk from one cohort to the next must be attributable to one particular change - the filter - is not appropriate, in my view.

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