I'm not sure who would consider nicotine non-toxic, maybe only in the strictest sense of the term, but it does constrict your blood vessels as well as all of the effects lsited above, which is not particularly good. As far as the study link, it's interesting, but the greatest source of nitrous acid comes from gas, as in gas powered stoves. And yes, the concentrations were inflated for the study. If you google nitrous acid, you can find all kinds of info. You're right about the safer then cigs thing, it probably is, but why would we bash cigs and have no idea what vaping is doing? A lot of us are not willing to assume risks for our families just because we need the nic and have decided to vape.