I think you're drawing a distinction between "addiction" as in, something that creates chemical withdrawals if you stop doing it, and physically makes it difficult for you to stop - and "addiction" as in, habit that you find yourself unable to consciously stop without help, that harms your life in some way.

Because porn/social media use/gaming etc can all be "addictions" in the second sense. Where they are compulsive habits that are harmful to our life and find it hard to break. They may not be "addictions" in the way that heroin is an addiction, but they are addictions in the more colloquial sense.

I know for sure I'm addicted to my phone. I find myself checking it all the time, toggling between different messaging apps multiple times in the space of a few minutes, hoping for a reply that will give me a hit of dopamine. To stop myself I'm now trying to install apps on my phone to prevent myself compulsively checking things and trying to become more intentional.

You may not like the word, but if I say "I'm addicted to my phone" people will nonetheless know what I mean. And that's what language is all about.