A great article on a very interesting topic. My major issue with smart drugs, is that you (probably) can't trick nature that easy. Running on 5 hours of sleep may work for some people, but there is a reason why most people need 7-9 hours of rest.
As with any substance use, i am very much concerned about potential damage that could be done on the long term. There has never been an enhancing substance in the history of mankind, that did not have sideeffects on the long (or very long) run.
In my personal opinion there is a reason evolution has not come up with a "working solution" for a permanent rise of concentration and focus -> Your body and brain needs rest.
Still i maybe will give it a try, just to see what it does to my productivity.
RE: Out Of Focus - A Month Without Smart Drugs