Props for the link, but the full text seems to be pay walled?

And the important bit seems to be

>nicotine concentration between 0.001 mM and 4.0mM.

And they found an effect starting at 1.0mW. But, this is what I hate about pretty much all scientific papers that clearly set out with a purpose in mind (good or bad) is the abstract doesn't mention what the hell 1.0mW. Is that even a feasible amount? Is that one puff? Is that 100% nicotine being directly vaped? What on earth is it? None of this is mentioned, for free anyways.