The original article spells it "coca" and so it is here, copied as it was published originally.
The coca plant is not the same plant that produces chocolate. The coca plant is used to produce cocaine...the cocoa plant produces chocolate.
Morales is a coca farmer. Which means he produces cocaine. He is undoubtedly associated with a drug cartel or even many; Hugo Chavez in Venezuela is known to be.
Um... no. Coca in its natural state is a non-narcotic plant with many legitimate uses. In Bolivia something like 80% of the population chews coca, drinks coca tea, and uses medicinal balms made from coca -- among other things. Other than rotting teeth, it's quite healthy in its natural state.
Cocaine is made by heavily processing coca to separate out a single alkaloid. You need hundreds (possibly thousands) of leaves to get one line of cocaine.
Your statement is like saying that growing apples equals producing cyanide, just because apple cores contain trace amounts of cyanide.
Morales grows coca. There is no allegation (much less evidence) that he has ever produced cocaine.