One the secrets to survive the altitude sickness in the highest capital of the world – La Paz – is to chew Coca Leaves !! Chewing coca leaves is part of everyday life here in la Paz. The coca leaves is supposed to help with more oxygen in ur body and adapt to the high altitude.. I bought a whole bag of it when I came for about 20 cents usd. You put a few leaves in your mouth, add some bicarbonate as well (it brings out the chemicals of the coca leaves) and it sure does help cope with altitude sickness !! Coca leaves among it’s many uses, is used to make cocaine as well as coca cola !!