D-Day for me tomorrow, decided enough is enough.
Three tips that worked for me, I hope they help:
1. Just tell yourself that you won't smoke tomorrow. 'Forever' is a too big a concept.
2. Refer to yourself/think of yourself as a non smoker. When someone offers you a cig, as they will, try and say - I don't smoke (instead of I've given up)
3. Stop putting cigs in your mouth - Seriously, it's amazing the way we can rationalise having a smoke. Stressed? Have a cig. Relaxed? Have a cig. Depressed. Have a cig. A need to celebrate. Have a cig.
What always happened to me was that I'd think - Shit I've gotta give up. I'd stop for a while. Then somewhere along the way I'd find some excuse to have one. Once I'd have the first one, it didn't matter anymore and I'd have another. I'd slowly start upping my intake until I was back to where I'd started. After a couple of months of that I'd think - Shit I've gotta give up...
Good luck, mate. It's well worth it.