It definitely seems misleading to talk about coca leaf use as cocaine use, given the common expectation for what that means. People reading the newspaper probably don't know all these details, and it isn't spelled out. I can't imagine some guy in a club not feeling like he was robbed after paying for a powdery drug and then receiving a handful of leaves. I can't imagine an Andean woman sitting down for morning tea being pleased to have a bunch of powder dumped in her cup.