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I know it is a bit odd, but in the short time I have been lurking and active on this board it seems to be a trend where ex-smokers, or at least aspiring ex-smokers, become hyper critical of potential health issues regarding their new hobbies.
So nice that you voiced that pants.
A lot of the self scrutiny is prompted by the 'newness' of the e-cig; and is intended I'm sure as a way to better understand and thereby defend the e-cig.
A lot if the hyper critical behavior you point to, IMHO, comes from the folks that are having a hard time quitting smoking and won't admit it. Even though they're vaping 48mg at 12v they are still having withdrawal symptoms.
Symptoms that more often than not could be assuaged with a simple pinch of snuff or portion of snus but instead have them actually attacking that which could be of the most help