Apparently people’s responses in this situation are a good indication of their vulnerability to addiction in general.

Anecdotally it makes sense. I’ve had morphine multiple times (after accidents) and found it meh. I certainly wasn’t asking for more. It so happens that I hardly ever drink and I’ve never done drugs of any kind or even wanted to*, despite having no moral objections to them and being around a ton of people who do them all.

*Okay, except psychedelics.