Can somebody be “immune” to addiction in the same way some people are especially susceptible to it?

For sure. There is nothing I could get addicted to. Whatever it is that causes this in other people, I just do not have it. And I have very high level of self-control (which I think is somewhat separate).

Force me to take opioids for a year, I could quit them in a day. Yes, even with the harsh withdrawal symptoms as no one can do anything about physiological addiction. I just do not give much of a crap about that sort of thing. I don’t know why I am this way nor do I care. But I am glad of it.