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And to compare the yields, a properly grown pot plant (that you can fit in your closet) will yield up to a couple of pounds of killer dope, whereas a properly grown coca bush ... well, you might be able to get a line out of it. But the lab equipment you'll need to convert it will const you more than the coke would have.
As for chewing coca leaves, indigenous people of Peru have been doing it for centuries w/ minimal withdrawl symptoms, a good leaf or two oughta give you a buzz like a cup of coffee. Moral of the story? Drink coffee, let the smugglers get you the coke.