<unk>  kills by allosteric inhibition of essential metabolic enzymes, leading to death from multi-system organ failure.<unk>  is tasteless and odorless and was used medicinally in centuries past for syphilis, psoriasis, lichen planus, anorexia, parasitism, and epilepsy. Though it has most notoriously been used for<unk> , it is not a particularly efficient toxin, leading to a slow and painful death.
Neron poisoned Briticannicus to secure the Roman throne in 55 A.D., and it has been quite popular ever since. Marie Madeleine in the 17th century and Catherine Deshayes in the 19th century became quite famous for the many people they poisoned with it. Reports of Napolean’s death by<unk>  are probably not true, though he may have been given<unk>  for treatment of anorexia associated with the gastric cancer he died from.<unk> ’s popularity faded with the development of a sensitive assay in 1836.<unk>  is found in some soils and is released into the air from volcanoes. Humans may be exposed in the smelting industry<unk>  is a byproduct of ores containing copper, iron, lead, gold, zinc, cobalt and nickel), from<unk> -contaminated fossil fuels, and from the use of inorganic<unk>  compounds in wood preservatives, pesticides (including ant killers), herbicides, fungicides, feed additives, war gases and paints, and in some folk remedies. It is the most common heavy metal toxin.
Arsenic poisoning
Mercury poisoning
Gold poisoning
Carbon monoxide poisoning
Organophosphate poisoning
Nicotine poisoning
Cyanide poisoning
Strychnine poisoning