You need to really focus on being determined to quit "NO MATTER WHAT CHALLENGES COME AT YOU"!
That's what this quitting thing comes down to in the end, as far as I'm concerned ... determination! Especially in the times of struggle. That's when you need it the most!!
And yes; go use that gym pass as you begin your quit! It will give you something to do to help keep your mind off smoking while getting you in shape at the same time - win/win! Some folk swear by excersizing when they quit. Something new to get you physically involved and you won't relate it to smoking either. Give it a try!