Why is this the case though?
Take coffee for instance, it's widely grown in South America--is most of the production run by cartels?
Or is it just that cannabis is a high-value crop, and it's easier to move the produce around the USA from within, rather than having to smuggle it over the border?
And if cannabis is a high-value crop, is it because not all states have 'legalised' it?
What if the whole world legalised cannabis, would it become like coffee?