Miriam-Webster defines addiction as follows:

Definition of addiction for English Language Learners

a strong and harmful need to regularly have something (such as a drug) or do something (such as gamble)

:an unusually great interest in something or a need to do or have something

Psychology Today states in an article on addiction this description.
https://www.psychologytoday.com/basics/addiction

However, most addictive behavior is not related to either physical tolerance or exposure to cues. People commonly use drugs, gamble, or shop compulsively in reaction to being stressed, whether or not they have a physical addiction. Since these psychologically based addictions are not based on drug or brain effects, they can account for why people frequently switch addictive actions from one drug to a completely different kind of drug, or even to a non-drug behavior. The focus of the addiction isn't what matters; it's the need to take action under certain kinds of stress.

I will briefly give my opinion at first, & hopefully others will chime in with thoughts & research.

In my opinion, AAS use, like anything else, can become habitual & habitual can indeed progress into addiction. I know in my case that I have an addictive personality & an addictive trait & with schooling from the school of hard knocks & many lessons learned the hard way, I have learned that I must hold myself accountable & monitor my actions. I have been both an alcoholic & a severe drug addict. Just like many here, when I got clean I turned to the gym & AAS use. Both have been therapeutic, but I have had to put the brakes on myself with the AAS use in the past. I have seen some that loved the injection & it seemingly gave a high, as well as constantly running new cycles, adding compounds habitually, & even the purchasing has became addictive & lets not forget promos.
I want this to be a learning experience & by bringing this subject to light giving individuals an opportunity to check themselves & the intent of why we do what we do. I for one have seen selfish choices of AAS & even excessive gym time cause family troubles & divorces. When we neglect those we love such as children or spouse to indulge in our pleasures, I believe we have lost sight of the goal & the reasons we started on this path. There’s nothing wrong with competing or just trying to live a healthy life or making them gains, but there’s not a greater blessing in this world than family!!