Hey recent quitter here too, keep it up! Its been nice having a working brain again, after 2-3 months I feel pretty good! Keep in mind it might take a while to return to baseline, but you'll get there. I was a daily, almost constant smoker from before covid until several years after, with a few remissions or whatever. I'm really hoping it sticks this time!
Working out can help, flood your system with some natural dopamine and work out excess frustrations. But honestly, you might just need to rest, if possible. The first few days can be very unpleasant. You'll get your appetite back and start having crazy ass dreams. Get plenty of sleep if you can! Try some brain teaser puzzles or read, working out your brain will help it find a new baseline, and maybe distract you.
Try to limit booze or other substances, IMO a hangover can like lower my willpower to where I decide I have to run to the dispensary. At least until you're through the woods. Maybe try to schedule a therapy sesh if possible, or hang out with a sober friend, go see a movie.
If you wanna talk, feel free to DM me


Okay, I'll edit out what I can't verify with hard evidence and try a self post!