Comment by gwern

> So far the IQ boost from any known drug intervention is very modest.

Absolutely; if you look at some of my other pages, you can see for yourself how little I think of most claims to improve intelligence...

I take this unreplicated study as being more evidence for the stimulating effect of nicotine rather than any genuine peak intelligence boost, in the same way that monetary payment can increase peoples' scores on IQ tests - you wouldn't say 'the promise of money makes people smarter', but rather, 'the promise of money "enables" people to work harder'.

FWIW, I think the Nisbett review is drastically optimistic in some areas (I've criticized it on HN in the past, although I can't quite seem to find a link to my old comment in Google), so the true picture for IQ interventions is worse.