[LidlRacer]

@Joseph
Für eine umfassende Antwort habe ich gerade keine Zeit, aber hier noch mal frische Kritik von schweizer Wissenschaftlern an der zuvor veröffentlichten "Hirndoping"-Studie der gleichen Leute, die sehr ähnlich konzipiert war:

Zitat von Neuroenhancement with Prescription Drugs and Drugs of Abuse among Swiss University Students

Another study found a 12-month prevalence of 20% for students when caffeine tablets were included as neuroenhancers [22]. A weakness of this study, however, was the definition of neuroenhancement and a questionable statistical approach because a 20% past year use in students appears very high.

http://www.plosone.org/article/info%...l.pone.0077967