I guess it could be considered a Public **Mental** Health Risk as porn addiction is real thing. Though in the same vein that would also make sex a public health risk, so... not really sure what is up here. The article you posted seems to be more about concern over them not banning assault rifles then anything else.
Let me preface this by saying that, your question can't be answered at the moment. Sex research is fairly new, and research on pornography is even newer (we don't want to be *scandalous* in science), so these areas are still in their infancy. Furthermore, just like all social issues, it is heavily at risk of bias in the study as well as the interpretation. In short, we really don't know. The data is hard to collect or reliant on dubious self-reporting, making research slow or unreliable, and this compounds with the fact that this area of study is new.
But, let's think about this a bit more. What are other things that are considered a public health issues? According to [this](https://www.cdc.gov/psr/
) page from the CDC, this includes things like alcohol, heart disease, nutrition and obesity, tobacco. These are the most serious, but it could stand to reason that something like pornography could have some risks. The existence of pedophilic content, the mental health concerns with pornography, questions about impotence and inability to orgasm with a partner.
But there are some issues with that. Most obvious is the lack of a direct link to physical health issues. Alcohol poisoning can kill you, heart attacks can kill you, but pornography... it can't do anything physical. Beyond this is the question of what defines pornographic content: Do we only refer to explicit acts of sexual interaction? Do we refer to any sexually suggestive act? What about suggestive material in non-pornographic media? What about sex in movies and shows? How do we classify erotica?
Ultimately, pornography has no obvious connection to health risks that make it unique enough to classify as an explicit health risk. In the end, this is purely political. Which should be expected--when do politicians listen to scientists?
I just did a little bit of research myself. Based on what I read from Wikipedia (I know that this is not a reference to use here, it seems that there seems to be very little scientific consensus on this: [Not sufficient data to confirm this](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4990495/
). This is also summarised in this (non scientific) [article by BBC](http://www.bbc.com/news/magazine-22987051
To reword my original question: While it seems clear that some people show a addictive behaviour in regards to pornography, is there any causality between porn consumption and addiction? If I regularly drink alcohol, this can lead to addiction. Is the same true for pornography?