coca leaves is different from cocaine. coca leaves are used traditionally for anti nausea and altitude sickness. It is not uncommon to stick a wad of coca leaves while hiking up maachu picchu. having said that..i cant stress this enough..cocaine is entirely different from medicinal herb known as coca leaves.

https://www.businessinsider.com/how-cocaine-is-made-2017-10 > how cocaine is made

https://en.wikipedia.org/wiki/Coca_tea > coca tea