Very best of luck. I know what you'll be going through because I've done it myself a couple of times now. I've been thinking of having another go at giving up again myself recently as well, though still at the 'this'll be my last pack' stage at the moment (going to get some nicotine patches first this time as I don't think I could go through the cloudy headed feeling again - wasn't so much the cravings that drove me mad the last time but not being able to think as quickly for a while until I got used to being without it). My cousin has just given up and the nicotine patches really seemed to help him, so if you find you're having problems then they may be worth a try (unless there's some health reason you can't have them ofcourse).
I gave up for around 6 to 7 months a couple of years ago, just decided one night I'd had enough, stuck them in a drawer and got myself into a mindset that if I took any from the drawer I was being weak willed, and this seemed to motivate me more than any of the health reasons (being a stubborn git I am!), had gotten over the fuzzy headed feeling after a while, no real cravings left and thought I'd done it for good (even though I missed it still as I do enjoy smoking I wasn't tempted), then it was the day of my CBT, being a bit hyped up and stressed over it all and watching the other guy who was on my cbt with me smoking throughout the day by the end of the day I took a single smoke off him and that was it. Followed by first few nervy rides on my own thinking 'I'll just get a pack of 10 to take on the bike to have the odd one to relax before and after practicing', then it went to 'I'll just have the odd one now and again when I'm not riding just when I really fancy it', to 'I'll just do it socially', to 'oh..no..I'm back to smoking every day and coughing my guts up in the mornings'.
It can be a slippery slope, so if this is your first attempt at it, it's worth keeping that in mind and running through where it might lead when you're tempted by that first cigarette. And if you do give into temptation, try to keep in mind that it doesn't mean you've failed, but just need to grip a bit tighter to stay off that slippery slope (if I hadn't kidded myself that I wasn't slipping it would have been much easier to give up again in those early stages where I was thinking 'I'll just buy a pack for now and then').
I smoked for years without really being addicted, just having the odd one socially, and thought I'd be able to go back to that, but I think once you've got into the habit of smoking a lot regularly it's no longer an option for most people imho. Obviously everyone is different ofcourse, and this is only me, so I don't mean to be patronising but just hoping that happened to me might help if you feel things going the same way so you can recognise it earlier.
Anyway, very best of luck. I hope it works out for you. Once you get over the first couple of months or so then you'll start to feel much better in so many different ways.
Also, if you're suffering from cravings doing some exercise can help as well. I found during those first two to three months I had more energy than I knew what to do with (driven partly by craving I think but largely from just being healthier and not having my energy drained by smoking) and if you exercise when you feel like that it'll help you to sleep better, the adrenaline will help with the cravings a bit, and it'll counteract any weight gain that seems to happen to some people when they give up (I actually lost a stone in the first couple of months as I just couldn't sit still and was exercising every day).
Hope you stick with it and good luck