The premise is that in a Capitalist society dope is a necessary illness.
In every society so far known, and even without society, people and even animals become obsessed by drugs and will forsake needs in order to procure them. Whether it's pigs who eat up the fermented apples under the tree, or lab monkeys who keep hitting the cocaine button until they die, or wino liberals who drink their way through boring jobs, it's the same.
Capitalism has nothing to do with it.
What the Black Panthers (great organization, cannot endorse too much) are saying however is that this tendency is fortunate for those who wish to control others. And I think W.S. Burroughs covered that as well, quite well.