上瘾               shàngyǐn            be addicted (to sth.)

进化               jìnhuà                evolution

生物碱           shēngwùjiǎn      alkaloid

尼古丁           nígǔdīng            nicotine

可卡因           kěkǎyīn             cocaine

土著人           tǔzhùrén            original inhabitants; natives

安第斯山       Āndìsīshān        the Andes Mountains

咀嚼               jǔjué                 chew

海拔               hǎibá                 height above sea level