This is a bit of a slippery concept, and I think that care has to be taken to differentiate addiction from simple 'abuse'. I'll just talk in terms of drugs, to simply things. To be psychologically addicted is to be caught in a conflicted state where one has an overarching desire to discontinue use or reduce its frequency or magnitude (in the medium to long term, particularly when assessed from a sober vantage point) but fails to do so when attempting such. However, what about continued, frequent overuse of substances prior to the mental examination that leads to desire to cut back? So in this sense, psychological addiction can exist latently for some time for people lacking a modicum of self-examination. The thing is, for the majority of non-addicts, desire to curtail use doesn't even come up due to the unproblematic nature of non-addictive use; eg, non-alcoholics rarely if every decide they need to cut back on drinking beyond the "wow, I partied a bunch this semester and should cut that out" type self-assessment because their drinking has simply not impacted their lives significantly. In fact, they'll just routinely cut back for no reason / on accident, as a manifestation of a lack of a problem to be managed.
From here, I would place common correlates of psychological dependence as follows:
1. reliance upon use to work, cope with stress, regulate emotion, render tolerable common situations, etc.
2. distress in the absence of use
3. compulsive use of a particular substance, be it redosing in amounts higher than desired or binging longer than is wanted
4. intrusive preoccupation with use while sober
etc., etc.
ebola
(I'll move this to mental health, depending on the responses)