Forgot to say: that ABSOLUTELY there are others out there with stories like yours, with several months or more of smoking sobriety and then went back. A co-worker here in the office said he quit for six months before and went back. (And he's now at 8 months yet again.)
And a guy I knew a few years ago said he'd quit for TEN YEARS only to start again.
It REALLY is an addiction, like alcoholism.
You need to talk about it, confront it, and just don't loose sight of the goal.
And ignore all these people that make light of it - it's A BIG DEAL! Ugh. HUGE.
I tried patches, I tried gum. I was prepared to try hypnosis, therapy - ALL of it. And if I relapse I shall continue those efforts.
I go through phases of snacking - nuts with no salt, dried cranberries this week, CARROTS have been really useful - try to snack on healthy stuff.
Good luck, Sir!