Mood modifiers have been used from time immemorial -- caffeine, alcohol, nicotine, immune system enhancement, vision enhancement, anesthetics -- we take that very much for granted, but just think about how great progress that is -- like, having an operation before anesthetics was not fun.
Za promjenu raspoloženja koriste se još od pamtivijeka – kofein, alkohol, nikotin, pripravci za poboljšanje imunološkog sustava, operacije očiju zbog boljeg vida, anestetici.. Većinu tih stvari uzimamo zdravo za gotovo – ali zamislite samo koliki je to bio velik napredak – jer, operacije prije uporabe anestetika, zaista nisu bile zabavne.