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This seems like you are being argumentative for no good reason. You may have misread the above post.

It seems to me that jacobolus was not defending vaping but merely wondering if we're all being a bit over-reactive at this point.

That position is not so much comparable to your referenced four-dog-defense as it is to something like "you've got a better chance of being killed by a lightening bolt than killed in a terrorist attack".

And that is a valid point to make when discussing any issue involving risk. Humans are prone to reacting to perceived risks without considering comparative risks factors. https://www.schneier.com/blog/archives/2006/11/perceived_ris...