Question yourself if your PMO addiction is linked to other habits as well.

I do it when I'm stressed. Not when I'm horny.
I can't deal with stress at all. Im so tired and nervous all the time.

 

If you're going to look at kind of the physics of it it's beyond habits people have but just repetitive cycles, and some are actually helpful for quitting the bad habits because some cyclic activity are built into nature - that's why some people even on this site work on their sleep/wake cycle.

Not everything is social or psychological, but it may be cycle-logical. Viewed from this perspective, it isn't 'so much' a matter of spending "too much" time whether it's social media (which of course is a big one) or anything else, it is a lack of synchronization with natural cycles and being hooked on artificial/unnatural ones that are always on, and on-demand. The fact that there are hospitals and other architecture now installing circadian lighting systems, which relates to the sleep/wake cycle should tell us something.

But more fundamentally, it is the difference between seeing time as a simplistic linear measurement of hours/days and seeing it as interlocking cycles in a networked interaction. The "interlocking" relationship actually supports the existence of the body itself because it's not just a sack of meat but a bunch of very intricate processes with its own cyclic activity, and when one part kind of goes on its own and run amok that's usually some form of disease.