The thesis isn’t that drugs aren’t inherently addictive at all, it’s that the addictiveness (which I’m defining as the degree to which it is difficult for people to stop using) is estimated to be higher than the inherent addictive properties of the drug would actually imply.

It’s not to say that the drugs don’t cause cravings, it’s that people without the aforementioned issues have a much more straightforward ability to manage those cravings.