All that said, it’s unclear how many people actually get sick as a result of handling tainted cash. Surely, most people conduct cash transactions without any noticeable health repercussions. But the reports are enough to send you screaming to the Purell—and perhaps to one of the emerging smartphone payment options too.
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Traces of coca have been found in mummies dating 3000 years back.  Other evidence dates the communal chewing of coca with lime 8000 years back.  Beginning with the Valdivian culture, circa 3000 BC, there is an unbroken record of coca leaf consumption by succeeding cultural groups on the coast of Ecuador until European arrival as shown in their ceramic sculpture and abundant caleros or lime pots. Coca consumption among the North Coast Peruvian tribes begins around 2000 BC as evidenced by the caleros found by Junius Bird at Huaca Prieta and the emergence of dedicated lime containers in the Jetetepeque river valley. Extensive archaeological evidence for the chewing of coca leaves dates back at least to the 6th century AD Moche period, and the subsequent Inca period, based on mummies found with a supply of coca leaves, pottery depicting the characteristic cheek bulge of a coca chewer, spatulas for extracting alkali and figured bags for coca leaves and lime made from precious metals, and gold representations of coca in special gardens of the Inca in Cuzco .  
An injected mixture of cocaine and heroin , known as " speedball " is a particularly dangerous combination, as the converse effects of the drugs actually complement each other, but may also mask the symptoms of an overdose. It has been responsible for numerous deaths, including celebrities such as comedians/actors John Belushi and Chris Farley , Mitch Hedberg , River Phoenix , grunge singer Layne Staley and actor Philip Seymour Hoffman . Experimentally, cocaine injections can be delivered to animals such as fruit flies to study the mechanisms of cocaine addiction.