I was recently editing an answer to the question Is secondhand smoke dangerous? to add some recent research results. My answer focussed on one of the more serious claims (that it causes lung cancer in non-smokers).
I noticed a more specific passive smoking question, Does second hand smoke cause cancer?, where the data I was summarising would be even more relevant.
It could be argued that the problem is the overlapping questions, but, I'm guessing, we allowed them because, though they do overlap, they are not exactly the same.
Given this the question arises: should I duplicate the answer in response to the other question?
Or do we need to find a new way to group related questions so a single answer can apply to both?
I feel slightly uneasy with duplication as that looks a little like getting two credits for one piece of work.