I'm in a bit of a rambling mood so I apologise in advance for any nonsensical items in my late(ish) night ramblings.
I've been thinking back on previous quits that failed and tried to work out what was different about this quit (which WONT fail). And my conclusion to all my ruminating is that the difference is knowledge. Knowledge leads to insight and having insight is empowering as it gives you the tools, in your own head, to succesfully kick the nasty horrible addiction and habit once and for all.
So my tip is, and I'm sure this will be written all over this form in posts over the years since it's been running... but here goes... Equip yourself with knowledge. Knowledge and insight allow you to know your enemy and therefore provide you with the tools to overcome 'him' (I seem to have turned my addiction monster into a 'he'...how curious !).
Read books on quitting. Read the posts on this forum (since joining I have spent lots of time reading of the experiences of other quitters at different stages of the quitting process) and pick up some fabulously spot tips, advice and support. Listen to your cravings... look at them (metaphorically of course) and examine them closely. When did they crop up? How strong? Don't hide from cravings - look them in the eye and slap them down.
In previous quits I always tried to forget about smoking and tried not to think about it. That was a big mistake because there is no way you can forget about smoking when you're quitting (unless you had a general anaesthetic!)
I have made this quit into a survival project. I am now beginning to go long periods of time throughout the day accidentally not thinking about smoking or quitting smoking. In fact there are times that I completely forget that I used to smoke. All because I haven't tried to not think about it.
Embrace your quit as if your life depended on it - because actually it does!