If you get the chance read the article. It's pretty wild. THe local FARC leader, the revolutionaries in Columbia who have pretty much lost track of their ideology, are basically running the country.
What they do is charge a 30% tax on all cocaine trades, but don't personally get involved in the business. However, the FARC requires that no one use drugs during the weekdays and even no one drinks, and if you violate those rules you are punished (sent to fight for the FARC). That said, crime is virtually nonexistent because the FARC makes all the rules and if you break the rules, you are in deep shit. Because money is not used, many transactions are done by trading in a bag of cocaine to pay your debts.
Of course the cocaine remains valuable, as it's all export to the US and Europe for money.
What is fascinating is how the FARC, a rebel organization, uses the drugs to support an economy through a barter system using durgs as currency. At the same time the FARC is able to maintain public goods such as public safety, judiciary, economic control and trade, much like a state through drug sales.
If you are interested in the drug economy at the source, or even for how drugs play a role in other parts of the world, this is an fascinating piece of journalism.