I gave up smoking in 1987 the night I got engaged. Started again 12 years later when I found out she wanted a divorce. I quit on 12/31/02 and was fine for three months, multiple stresses all hit at once and I started to sneak em again. BUT since I had announced to all my friends and all the bartenders that I had quit, it was hard to sart up again. There is no secret to quitting, I just can't ever have another cigarette EVER. I take zyban to ease the crunchies it helps, but I realize that I can't ever have another.
For what its worth, when I quit the first time, I was relieved to be free of the expense, smell, and all the other stuff thats part of the ugly side of smoking. I look forward to getting there again. Keep trying.
Good Luck