Smugglers, perhaps, but the came up with that abundant coca leaf necklace for Morales before he departed the place. Didn't come from nowhere.
Morales, the coca farmer (and smuggler, certainly...because he sure isn't throwing his harvest away every six months) and Fidel are fond of one another.
Thus, if Cuba's "rather hard on cocaine smugglers," they're just working on Morales' competition.
Typo, previous (^^):
...but THEY CAME UP WITH that abundant coca leaf necklace...(Cuba did).