10/8
Various "addictions" such as Internet addiction, video games, porn addiction, etc. are typically explained through the lens of them "hijacking the dopamine system" based off an alleged association between dopamine and pleasure. The idea further suggests that these stimuli are readily available 24/7 and so people get 'addicted' to the loop of dopamine hits of pleasure. This, I posit, is a good starting point, but is insufficient of explaining the phenomenon. Take any person and ask them if X gives them pleasure where X is something that most people would define as 'healthy' or at least unassuming--such as "going for a walk", "the rain", "being in the sun", etc. Invariably, every person you ask this will endorse the experience of pleasure to something; however, we'd likely be unable to find a meaningful amount of people who would endorse being 'addicted' to those things. I assume then that the dopaminergic connection to addiction is more complex than this, especially given recent research that suggests that dopamine is much more strongly associated with "motivation" than it is simply pleasure. Lacerate the dopaminergic system in mice, and they'll be so unmotivated that they won't even move to eat and will eventually die of starvation.
With this said: I find it interesting that there is a theme of 'finishing' for the various things identified as frequently addictive in the list above. You want to "finish" the next episode, "finish" the level you're currently on, "finish" one more Baal run, and when watching porn you quite literally aim to "finish". We may better understand this addictive process by broadening our understanding beyond the simple connection between dopamine and pleasure, but rather view this dynamic as hijacking the motivation system (which, of course, includes 'reward' aka 'pleasure').
People contemplating giving up these addictive habits will often say "But if I quit doing X, what am I going to do?". The 'do' seems like a very telling word, and immediately evokes a connection to the theme of motivation and completion of things 'to do'.