Glad to read your back onto a quit. Pretty much anything I can say here has already been said.
So maybe some advice that helped me... you only have to quit for one day... don't focus on forever or for a year... just focus on 1 day... you quit for a month last time so you know you can quit for 1 day.. each morning, wake up and say to yourself "NOPE, I will not smoke today, it's 1 day, I can do that, I've done that, yep I got this just 1 day"... then the next morning you repeat. You are tricking your brain, in the moment you are telling yourself I only have to quit for 1 day it's not long, I can do it.... and you can, easily... the stupid part of your brain that wants to smoke goes.. cool we are smoking tomorrow, the pressures off...but then first thing next morning the smart part of your brain goes "NOPE, I will not smoke today, it's just 1 day I can do that, I've done that, yep I got this just one day".... strangely the stupid part of your brain, the bit that wants to smoke, forgets that you made the same deal the day before and it goes.. yep only hanging out today I'm getting a smoke tomorrow.... but it's not, and it gets easier each day.
Oh and tip with the Air Cigarette don't use a pen, I kept drawing back too hard and getting a mouth full of ink...the air cigarette was much better... or a pencil.