Wishing you lots of luck. I think most - if not all - of us have been in your shoes and know just how frustrating it is. I can't even remember how many people would tell me "just don't buy any more cigarettes", most of whom were never smokers, and expected that to be some grand revelation that would make me quit instantly. That's like telling someone who has a bad cough from the flu to "just quit breathing" and things will get better...
For me, I struggled with all of the quitting methods for years. I'd do well on some for a week or two, then something would set me off and I'd bum a smoke from someone. That usually turned back into a habit for however long until I decided to try again. Then rinse and repeat. It was maddening.
I'm not sure why vaping has worked out so well for me, but I honestly feel like I've actually quit this time. I simply don't have a desire for a cigarette and, in fact, now find myself repulsed by the smell of them. From the start, I've always kept a variety of juices on hand so that I don't get burned out on one flavor. I actually keep several tanks filled with different juices in a little travel case that I carry around with me everywhere. Sometimes I swap out tanks every time I want to vape.
Prayer and meditation has also been very helpful to me, but so as not to sound too 'preachy', I won't delve too far into that. Mindset is obviously important, so I try to find things that take my mind away from stress when it starts to build up. Music plays a major role in my life, so I always keep an MP3 player around with tunes that I've created or tunes that I can just lose myself in. That usually leads back to meditation. Again, I hope you find what works for you and finally drop the terrible smoking habit for good.
If meditation and music appeal to you, give it a shot with this playing in the background:
I can't tell you how many times I've zoned out listening to that song, and others like it, and completely forgotten about my urge to light up another cigarette.