As with everything related to mental health, yea, it depends. Some people may be addicted to a single action - their brain may overblast happy brain chemicals specially in response to alcohol or some other substance. Other people might just get happy brain chemicals from any repeated action. Addiction is usually not substance specific and those people will merrily transfer their obsessions so for the majority of people addiction ends up being a lifelong game of finding a fixation that is minimally harmful… for others, not so much.

Brain chemistry be wack dog.