When somebody talks like this, ready to ban social networks, videogames, pornography, the whole internet, and pretty much every freedom that billinons of people enjoy, by comparing it to drugs, it scares me quite a lot.

That’s a massive leap. Recognizing a fact about those things does not equate to being ready to ban those things. The same is true of drugs!

I think the arguments you're currently having with people come down to: To what extent do I control what I myself do?

People have a tendency to push blame to external forces rather than take responsibility for their own actions. But personal responsibility cannot be the full story, because (almost) everyone acknowledges that drug addiction is something over which people have starkly reduced control.

So the question remains: What about other things "in the middle" like social media or porn "addiction"? Is it the fault of the person, the external force (which you must admit is consciously organised with the goal in mind of promoting the addictive behaviour, since their bottom line depends on it), or some mixture?