Generate text that refutes this claim: Coca chewing is harmful and should be proscribed  The original decision to ban coca chewing was based on evidence that this was indeed harmful to human health. A 1950 report elaborated by the UN Commission of Inquiry on the Coca Leaf with a mandate from ECOSOC states that: "We believe that the daily, inveterate use of coca leaves by chewing ... is thoroughly noxious and therefore detrimental." [1] Therefore the risk of health harms should not be dismissed or undermined. Coca is also different to caffeine and other similar products in in its capacity to be diverted to highly potent, dangerous, and damaging use in cocaine. Therefore it has unique health considerations which make its prohibition acceptable.  [1] Jelsma, Martin. “Lifting the Ban on Coca Chewing”. Transnational Institute, Series on Legislative Reform of Drug Policies Nr. 11. March 2011.
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The burden of evidence lies on the side trying to prove its harm, not on the side asserting that it is not harmful, and so the lack of categorical proof of its harm is in itself an argument for legalizing its cultivation and chewing. If proof of health risks arise then they can be addressed, but until then the ban is inappropriate and should be lifted.