I'm not sure YouTube addiction is the right term.
It's more like a media addiction.
YouTube is one offender here.
But "short" media is way more addictive(1) weather it's TickTock or YouTube shorts. (1: Easier flow to the next video, shorter attention loops, more randomness between hit and disappointment, etc.)
I don't know how scientific funded
the "way more" part is, but from speaking with people and personal experience I would _guess_ the potential for addictive behaviour for short form video is not just slightly (a few %) but hugely larger (like 200%-1000%). Through the long-term binding potential might also be shorter, but then that doesn't mean it's not a problem as you likely would just bounce between short form video and other media in your addictive behaviour (e.g. longer form video).