Day 3 cold turkey. Super depressed

I’m starting to think about giving up. How long does the depression last? I can’t focus and I don’t have motivation to do anything, but I have to work. I’m starting to think maybe I can smoke 2/3 cigarettes per day and stop gradually, but I know it’s a trap. What can I do? 😭

Edit: I relapsed. I did a few puffs from my friend’s vape since I was not able to function at work. I guess I’m starting from 0 again now