In the late 1970s a Canadian psychologist, professor Bruce Alexander conducted the now famous Rat Park experiment into whether drugs caused actual addiction. The ‘Rat Park’ experiment found that laboratory rats which were kept isolated in cramped metal cages were more likely to relive their distress and use drugs that were available to them.
While rats that were previously exposed to morphine hydrochloride for 57 consecutive days for the most part choose plain tap water rather than water laced with morphine when they were rehoused in a specially designed rat park. The rat park was 200 times bigger than a standard laboratory cage with 16–20 rats of both sexes in residence, an abundance of food, balls and wheels for play, and enough space for mating and raising litters.
Read the rest of the Rat Park comic by Stuart McMillen.