The word 'Smoke' of the name 'Smoke-on-Trent' derives from the observable layer of thick smoke that overshadows the city, caused by all the pot that is smoked by the inhabitants. The '[up]on Trent' originates from the small, although not so conspicuous, trickle of nephrotoxic "water" that runs through the city, known as the River Trent. Despite being labelled as "water" by the residents, the River Trent is comprised of: 22% fecal matter, 19% urinary excretion, 17% cockroach poison and 35% semen, leaving the remaining 7% as H2O, or water.