You cannot “get addicted to almost anything.” That’s nonsense. The DSM-V does not recognize masturbation, porn use, or sex as causes of addiction. There’s no such thing as “porn addiction,” for example. On top of that, it’s not as if masturbation addiction is a new idea that science has yet to accept—it’s the opposite, with psychology recognizing that the concept doesn’t hold up to scientific inquiry.

People who compulsively or excessively masturbate almost always have an underlying cause. Masturbating is the symptom of that cause, and addressing the root should bring any excessive behavior into balance.

The issue arises, though, that the internet often thinks that being horny more than their peers means there is something wrong with them. People tell them they’re “addicted” to sex, and purity culture spreads in earnest. There’s now entire industries that have sprung up based on this pseudoscience, and often because of cultural or religious upbringing, people do not question it.

There’s plenty of good resources covering sexual behavior and addiction. As much as I dislike Google, Google Scholar is a good way to find papers and studies on the subject(s).