[greygoo222]

The trouble with the dementia prevention claim is that while the retrospective studies are promising, none of the RCTs really show results. You can argue this is because the RCTs don't dose enough nicotine early enough to matter, and that's likely true, but retrospective studies can turn up all sorts of phantom correlations. Right now I would say we don't know for sure, and I wouldn't recommend nicotine as a preventative measure.

I would recommend nicotine as a stimulant, though. It is a solid adjunct to caffeine.