While true, the cocaine is processed out of the leaves themselves and sold to pharmaceutical companies. The remaining leaf product is used in the flavoring.

I’m not sure if it is still legal, but importing “coca tea” - that is, tea bags filled with shredded coca leaves - was legal at some point and a few enterprising folks imported a few kilos of it and processed it into the drug.

It's still legal to buy decocanized coca leaves but I think the odds of getting anything worthwhile out of it would be slim and probably more expensive than a plane ticket to Peru.