I'm generally a prude when it comes to drugs, but I wonder how much this would increase cognitive muscles. I say this because I would expect the brain would, after a while, become used to this externally induced effect and therefore disregard internal mechanisms to do so. This is pure conjecture, though.

It would, however, be interesting to momentarily feel what it's like to obtain that kind of concentration in order to try to mimic it without the drug.