People with chemical addictions face days or weeks of trembling, seizures, hallucinations, physical pain and the risk of death, when they try to withdraw. To compare that kind of experience with (say) withdrawing from Faceache is to imply that physical addiction is just a failure of willpower and self-control. It isn't so.
Physical addiction has been stigmatised as a failure of self-control more-or-less forever. It is still thought of that way - even when the addiction was caused by taking drugs prescribed by a physician, for perfectly legitimate reasons. That stigma results in inadequate funding for addiction treatment, loss of jobs, loss of homes etc.
I hear the story that "addiction" is at root an addiction to the dopamine hit. I'm sorry, but I don't buy that. The dopamine hit occurs when you do something that gives you pleasure. We all do that; and if we can, we repeat it. But we don't get the shakes when we stop doing it - we just might feel crap, is all.
When famous people like Michael Douglas claim that their personal failings are the result of "addiction" to pleasure, they are sidelining/gaslighting people who really are addicted, and making it seem that the problems those real addicts face is equivalent to the problems of a person who lacks self-control.
I think that's pretty despicable.