@TonkaTruckduck
Thank you all so much for your replies.
Champix scares me to death, I should have mentioned that. I know a friend of a friend who had a hugely adverse reaction to it and became psychotic and ended up getting sectioned, and when I looked into it it's a documented side effect 
.
@xdownwiththissortofthingX I think most people who quit still enjoy smoking on some level, otherwise they wouldn't smoke, they'd just have stopped. I hate the way hair and clothes smell, I hate the power it has over me, I'm always wondering how and when I'll fit a smoke in. I hate the fact I can barely run 5k cos of the fags. But the moment I light up I'm in heaven, but feel shitty afterwards. So whilst I love smoking I hate being a smoker if that makes sense.
"So whilst I love smoking I hate being a smoker if that makes sense"
Absolutely.
I dare say that if smoking came with none of the drawbacks, so no health impact, low cost etc, I'd probably still smoke myself, and despite being a non-smoker for over 13 years I still sometimes find myself sitting with a post-dinner coffee, and half absent-mindedly pondering what is missing without realising I'm doing it.
I enjoyed the physical sensation of smoking and the effects of the nicotine, of course I did, why else would I have smoked in the first place if I truly didn't enjoy it? The change came when I sat down and seriously considered what the smoking was doing to me in a rational and practical sense. I was taking a significant part of my salary and literally setting it on fire, in order to do something that was antisocial, poisoning me, and ruining my long-term health. I started getting serious bronchial spasms every single time I got a cold or a sniffle, and I couldn't climb one flight of stairs without being out of breath.
It just got to the point where I realised 'this is ridiculous' and the negatives far outweighed the perceived benefits and pleasure derived from smoking. Once you are at that point it's a relatively simple process to quit because you are already armed with all the willpower you need. You are already essentially an ex-smoker, you just need to put your final one out.
I stand by what I said though. If you genuinely are still in a place where you are trying to convince yourself with statements like 'I should give up' and 'it would be good if I could give up', then no, you're honestly not at the point where you'll make much of a fist of it because it's clear you still want to smoke and just don't want to quit enough to be successful.
"I am quitting/I have quit" is a totally different mindset.