But where's the link to centrophenoxine and racetams? Your link only talks about anticholinergic drugs. I have seen such results about benzodiazepine http://www.health.harvard.edu/blog/benzodiazepine-use-may-ra...

When you are chemically toying with your brain, it is good to know if there are any adverse long terms effects. Risk vs. reward. Surely some non chemical ways of modifying the your brain can also have adverse effects: like eroding concentration due to constant multitasking.