I don't know about refined cocaine, but coca leaf (either chewed or boiled as a tea) has been part consumed by the people of the Andes for thousands of years.
I love coca tea and coca wine.
Not that I agree with this, had my share of teas and chew in Bolivia (with what locals called 'activator', at least thats how miners did it in Potosi), apart from local lack of sense in gum/jaw there wasn't any real effect... no more than a regular coffee (which doesn't have any tangible effect on me, but I enjoy the taste & ritual).
But from plant you can make cocaine, so I get the logic. Funny thing is, some botanical gardens in Europe have the plant, not marked in any obvious way apart from latin name. I can confirm that it contained alkaloid, the numbing gum sensation was quite strong.