I'm right there with ya! I quit at least 20 times in my life, the longest I went was (get this) 5 yes 5 years and went back. It's all the stress crap. I've quit for 6 months, another time 6 weeks,and 6 days heck even 6 hours. I've tried that new pill chantix twice. that pill works great but my stress level was just more powerful. I still plan on quitting one of these days.
So you hang in there and don't be like me, lol, you can do it.