Yes, Coca is the plant that ultimately leads to the end product of cocaine. Cocaine is taken to be inherently bad - something that society should keep out of the reach of all its citizens. In reality, the massive amount of effort finding and destroying all Coca plants is far more damaging the cocaine in any country.
We try so hard to outlaw anything to gets people high. People will always find something else to smoke, snort, inject, or chew. There's no point in outlawing yet another plant that just does something peculiar when you chew it. It's pretty stupid and it doesn't hurt anyone. If it's that big a deal, just put an age restriction on it