Has porn make me a slower thinker and made it hard to concentrate?

I've been on a nofap streak of 6 months to be exact and I noticed all the benefits that everyone talks about, but the biggest one that I noticed is I had a clearer mind which made me a quicker thinker. I think it's because my brain fog caused by porn had vanished and my dopamine levels were at a healthier level. However, now I'm struggling with porn addiction again and my brain feels slow and I've got very bad brain fog. When my brain feels slow and my concentration isn't the best I know that's not the true me because I'm a sharp person in general. So can you guys give me any evidence for this claim or is it just an opinion?