>>necessary condition for addiction. Necessary, but not sufficient

You might also note that the GP said nothing about frequency of use, only "long time psych user", AND that no one here has defined "high frequency" in terms of an actual threshold for addiction.

The fact is that for all drugs, and especially for the psychedelics, there are far many more people who use occasionally and responsibly than the subset who are addicted. AFAIK, the psychedelics are not considered addictive at all, either physically/physiologically or mentally.

I agree. Traveling expands the mind, but you don't want to be traveling all the time. Is travel addictive? Maybe for some but for most of us probably not

High necessity of use is a frequent condition for addiction.