As an addict I'd say that it can't be used in a healthy way. What I mean by that is that there's no benefit to watching porn. That doesn't mean it's always going to be bad but that at best it's neutral. If you can keep it under control and it doesn't negatively affect your life in other ways then I don't think you need to worry about it but it's a slippery slope. If you take 100 people and give them access to porn I'd bet that the total effect is going to be a net-negative even though most of them are going to be more or less unaffected.
As an addict I'd say that it can't be used in a healthy way. What I mean by that is that there's no benefit to watching porn. That doesn't mean it's always going to be bad but that at best it's neutral. If you can keep it under control and it doesn't negatively affect your life in other ways then I don't think you need to worry about it but it's a slippery slope. If you take 100 people and give them access to porn I'd bet that the total effect is going to be a net-negative even though most of them are going to be more or less unaffected.