1.   At the second, Cobaria begins by filling his cheek with coca leaves, the raw material for cocaine.

2.   Barrancabermeja, the only large city in the region and an important juncture for everything from coca leaves to contraband gasoline, has strategic importance for the armed bands.

3.   But as more and more farmers grew coca instead of food, prices for coca leaf dropped, and the cost of the food they had to buy soared.

4.   But coca leaf prices are beginning to rise again as flows to Colombia begin to pick up.

5.   But as more and more farmers grew coca instead of food, prices for coca leaf dropped, and the cost of food they had to buy soared.

6.   But Colombia has also displaced Bolivia as the second-largest producer of coca leaf, after Peru.

7.   Coca leaf is the raw material for cocaine.

8.   Cocaine hydrochloride, the scientific name for powdered cocaine, is refined from an alkaloid leached from coca leaves.

9.   Cocaine hydrochloride, as powder cocaine is called scientifically, is refined from alkaloids extracted from coca leaves.

10.   Cuban President Fidel Castro, Queen Sofia of Spain and former Spanish President Felipe Gonzalez chewed coca leaves during state visits to Bolivia.