Mind altering drugs and studying?

http://www.independent.co.uk/news/science/mindenhancing-drugs-are-they-a-nobrainer-1708988.html

The link above directs you to an article published by the Independent that addresses the issue of mind altering drugs and their place in academia. Whilst the article discusses various drugs that are now becoming popular amongst students, all of which are used widely in other areas (for example Ritalin, used to treat children with ADHD) the main gist revolves around a highly debated suggestion from John Harris, director of the Institute for Science, Ethics and Innovation at the University of Manchester, and editor-in-chief of the Journal of Medical Ethics. The distinguished Professor of Bioethics says it is time to embrace the possibilities of 'brain boosters' and chemical cognitive enhancement.

Do you think it is fair that healthy students take mind enhancing drugs to concentrate harder in exams? If yes, then who should the drugs be made available to? And if no, then what's the difference between taking performance enhancing drugs in the context of studying and getting extra help in the form of tuition?

Regardless of the answer to the above questions, is it too late anyway as all these drugs are easily accessible on the Internet and it would seem that at least some of the world wide population of students have been embracing the concept of mind enhancing drugs for years...