Has that been proven?
As far as I am aware the e-cig blood plasma levels of nicotine are far more like an NRT one (gradual increase followed by slow levelling off) while the cigarette blood plasma levels spike very high very fast, followed by rapid decline. This may be partly due to tobacco additives to increase the absorption of nicotine (I understand ammonia is one such additive used). But the only studies I saw were a few years ago. Some research done by Intellicig led to them offering 45mg juice a few years ago, as this apparently more closely matched the nicotine levels achieved through smoking, however an Intellicig is a very early e-cig design. I'm not sure how much work (if any) has been done with high power e-cigs of today. I've no idea what the levels would be like on someone vaping 6mg juice from a dripper at 100w would be like, or 18mg juice on a rebuildable tank at 15w for example... I don't think that has been studied by anyone (yet).
I agree with SJ in that we need to be wary about putting stuff like that out there unless there is really good research to back it up.
EDIT Just as a side note some might remember there was a story released a few years ago that e-cigs delivered NO clinically significant dose of nicotine and that e-cigs were a placebo. The study was done with some low quality e-cigs with never before vapers taking very short timed puffs... You'd think that would appease the naysayers because if they don't deliver nicotine, how can they be addictive, right? Well no, the naysayers just said the study proved that e-cigs were "ineffective" and therefore should be banned anyway...