As you can see in my banner, I haven't been this long without a cigarette in forty two years. The fact that I was able to give them up still amazes me. As for relapsing, I can't pass judgment on anyone who slips up, or offer any advice beyond 'take it one day at a time.' Any amount of time you can go without smoking is better than no time at all. You can rely on your friends and total strangers in this forum to support you in your efforts to quit. If that's what you want, we want it for you, too. Good luck in your efforts.
For my situation, I have had to make a firm resolution not to let myself relapse. I have to regard it like it were alcoholism or drug addiction. Now that I'm clean, if I convince myself that just one is OK, one will lead to more, and I'll be back where I was before long, and all my efforts to get and stay clean will have been wasted. Next time it might be a lot harder to quit than it was this time. I don't want to find out, or go through that again. Don't think I haven't thought about it, because I have. It took so many years for me to get off cigarettes, I don't want to go there again. And I can't disappoint my wife, who is so happy that I quit. I hope you don't find it arrogant of me to say that if I can quit, anybody can. I didn't think I could, but I did. So can you.