Skex, I'm really not seeing what you're seeing in this thread.
The issue over the addictiveness of nicotine outwith tobacco in not fringe. Karl Fagerstrom, the author of the world's most used clinical measure of tobacco/nicotine dependence, the FTND has recently renamed the test the Fagerstrom Test of Tobacco Dependence because
of new evidence. - see also this blog by Robert West in which he asks Fagerstrom to
estimate how addictive e-cigs are (scroll down to May 9th - no permalink, sorry).
The fact is, no-one knows how addictive nicotine in e-cigs is to tobacco naive humans. There's literally zero research from which to draw good inferences, and the ethical considerations should be obvious. It's going to take years of e-cigs being used in the wild to derive this stuff from clinical epidemeology. Certainly, sticking vapers in brain scanners will tell us little about this.
You do know that inferring brain-behavioral data from neural proxy measures such as fMRI is
very controversial in and of itself? It's far from a dead-cert that much is added to our understanding of human behaviour from these measures generally, let alone from this study in particular.
That said, I'm glad it's happening, and that some chap at Imperial's booked some scanner time. It will be interesting to see what he comes up with.