If I recall correctly, coca leaves are also present in Coca Cola, that's why it is impossible for someone to easily mass produce an exact copy due to the risk of looking like a coke manufacturing firm.

This reminds me of a story my friend told me of when his friend went hiking and ate something called Tongkat Ali. It is basically natural viagra. He absentmindedly munched on it for energy (as it is normally good for energy). However, he had to go to the hospital to deal with his raging.. you know. All in all, be careful what you take. It could be worse!