This is big money. We are already dealing with problems from the Afgani regime due to the fact that opium production is up and too many poor Afghani farmers have no other means of making real money. However, this is a more troubling development for many reasons, especially the political realities of Chavez 'buying' allies in the region with this money.
We have to also realise we have no southern border as such. It would be too simple to use mules to cross our border with tons of the stuff.
Probably the only problem Chavez would have bringing dope into the country would be with Mexican competitors.