So i like weed, a lot but i think it's made me slower

So I'm 17 and in the past 6 or 8 months I started trying weed, I tried it a few times with my friends at the time but we only did it about twice a month if even then I started doing it every weekend at about 4 months in and then the past 3 months I've been smoking weed almost everyday consistently I've lessened the amount I do it now but I still do it pretty much every weekend but I'm starting to think it's having a negative effect on me but perhaps that's simply due to lack of moderation and don't get me wrong I still love weed and the effects it has but I've noticed a decline in my clarity of mind I used to be quite intelligent but now I feel as though it's been dimmed somewhat, this effect used to occur for a few days after smoking weed but it always faded but now I kind of notice I'm less responsive in terms of comprehension I lose my train of thought a lot more and generally feel less sharp my question is, is this a permanent effect can it be lessened with reduction of use and if I stopped smoking weed altogether would the effect diminish over time I suspect it would but to what degree I'm not sure