We already do
Part of the reason we are in this mess, is because certain factions working within the CIA ARE in the international drug trade, and have been using the worst of dictators and war lords to keep their drugs flowing. They, in turn, use the money to fatten their wallets, buy defense companies and prop up other dictators or regimes to suit their purposes.
Drugs and guns have been going together like cereal and milk for centuries now.
Except, the warlords are now armed to the teeth and about to bring us all into their battles for money, power and religious beliefs.