I quit almost 3 years ago, (so far so good), and one other time for 4 years before relapsing. The important thing, IMO, is to realize that you are addicted to nicotine, not "smoking". If they took out all of the nicotine from cigarettes, 99%+ of smokers could quit tomorrow.
Nicotine is supposedly the most addictive substance known to man, as measured by the percentage of people who ever tried it once and then become addicted to it at some point in their life. Believe it or not, lots of people try heroin or narcotics once or twice w/o ever becoming addicts; not so w/ nicotine.
Why the mini-lecture? Because it's important to know that you are fighting a gnarly physical addiction, not merely a "bad habit" of lighting stinky tubes and sucking on them all day. One of my best friends "quit" smoking a few years ago but switched to the gum, he chewed the gum daily for
two years! 
He never gave up nicotine for one day, he just changed his delivery method. And guess what? He is smoking again. Big surprise. I don't believe in the gum or the patch, I smoked w/ the patch anyways after a day or so. You need to stare your debilitating addiction straight in the eye and quit
nicotine, go to battle w/ it and win. You can do it. But you have to treat it like a lion in a ring w/ you, and the cravings and mental tricks that it uses are its weapons. Once you accept that, you can deal w/ them. In my experience, once I totally accepted that this addiction was powerful and that it had me bent over for years, it made me so pissed-off that I became stronger and it became weaker. Chewing nicotine gum is admitting defeat before the battle has even begun.
A powerful mental tool in the fight against addiction is the knowledge that "a craving will pass, whether I give in to it or not." If you smoke, the craving will go away. It will also if you don't smoke. Your choice.
One of my best friends recently quit a 40 year Marlboro habit when he got divorced and started online dating. The selection of women his age who smoked, (and therefore would date a smoker), was enough to make you stab yourself in the eye w/ a pencil. It's a gnarly addiction. If they took the nicotine out, every smoker in the world would quit tomorrow. I wish you success.
