I get "flashbacks" from a ton of things. Used to get them from fantasy books frequently when I read those in piles in my teens, or even from video games (those from Tetris were nasty xD). It's just how memory works. Basically like having an earworm.
Yeah, I also now and then get flashbacksfrom porn (mainly from written erotic stories, though, but that, and drawn images, is 99% of the porn I consume), but I wouldn't consider that any issue. Often, it's from the better-written ones which I would also enjoy as literature. (well, I'm asexual, so most "normal" porn doesn't do much anything for me (never has, so no "desensitization"), so I tend to read/look at mostly fetishy stuff, which often is a bit more elaborate, relatively speaking).
I still think I do have a porn (or rather masturbation) addiction, myself. As you may know, I'm a transmale, and on hormones since 1 year, and not that used to having a higher sex drive, so still learning how to handle that.
But the problem to me doesn't seem to lie in being exposed to pornographic material, but rather in the amount of time spent on it, and in that when doing it too often it leads to a mindset in which after a while it's not even really enjoyable but one still can't stop.
I would however like to also stress the benefits of porn. As long as it's not only the same kind of PWP all the time, it can teach you a lot about yourself when you watch your reactions to it.
Some approaches that I'm currently trying out and that look promising:
Whenever I feel like fapping and/or going to some adult website and can hardly hold myself back, I make it a rule that I first need to spend 5 minutes meditating before being allowed to. If I then still want to, I can (at least for, say, half an hour or so).
I think I got the idea for that from some porn game which I played a couple time a while ago
(who can guess the game gets a virtual cookie)
Also, my doctor told me I spend too much time sitting at a desk (well, most of my work is done on computers, duh) and I should reduce that (I am allowed to spend any amount of computer time lying down or standing, though), and also doing that will probably help me. I try to get into a mindset where being not at the computer is the default (at least in my freetime), instead of having being at the computer as the default.
Since a lot of this thread seems to have been on religion: Do you all really think that will help the matter? Besides some versions of "see a psychologist/get external help", I haven't seen anything in this thread that looked like advice to me, just a lot of proselytizing (perhaps I've overlooked something, though).
All the advise I gave here is fully in line with my own religion; if yours can't provide similar, then that makes it even more doubtful to me that converting to it would be of any help.