Please let me offer you people some encouragement.
Seven years ago, I quit a 32-year tobacco habit (addiction). I had tried quitting many times before, but never stayed quit very long.
I found a web site that specialized in helping people quit. It was sort of like "Alcoholics Anonymous" online. I joined a quit group, and got to know my "quit brothers and sisters" via online chatting. We logged in every morning, made a post in which we promised to quit tobacco for just that day (one day at a time), and promised to call a quit brother or sister before we "caved" and went back to tobacco. The group approach really helped me. The depressing thing is that sometimes when I go back to that web site (after 7 years of being quit), I see that some of my quit brothers or sisters have joined a current quit group. They caved. Nicotine ALWAYS wants you back.
Here are some things I learned that might interest you:
1. Only about 5% of people who quit actually stay completely quit for the rest of their lives. The same quit percentage as heroin addicts.
2. The best way to quit and stay quit for the rest of your life is to just get pissed off and quit cold turkey.
3. All quitters are still addicts. No matter how long you stay quit, you're still an addict. "Just one" is one too many, and will likely put you right back in the midst of your previous habit. Just like an alcoholic taking "just one drink" after being quit for 10 years.
4. Anyone who quits and fails will return to their previous level of consumption, or greater. Most people who go back to their habit fool themselves into thinking they'll "just smoke on weekends" or "keep it to 5 cigs a day". That's just their still-addicted brain trying to fool them into giving it what it wants: nicotine. And it will always demand more and more, until you're right back to your previous level of consumption.
5. Nicotine Replacement Therapies (NRT - nicotine gum, patch, etc.) work only to a moderate level. And based upon what I've learned, they are a waste of time. You are still an ACTIVE nicotine addict; you've just changed the delivery method. And once you quit the NRT, you'll still have to go through the hell of withdrawal and recovery. The NRT just delays that; it doesn't eliminate it.
6. There ARE drugs that can help. Chantix and Zyban (generic name is Bupropion). Chantix reduces your body's ability to "enjoy" nicotine by blocking nicotine receptors in your brain, thereby (hopefully) causing you to quit since you can't enjoy it.
Zyban (which I used successfully) is a very good anti-depressant (with no sexual side effects). When it was first developed, there was one unintended positive side effect reported by many users - they lost the desire to smoke and were able to quit. Since you'll likely be depressed as hell for a few weeks after you quit, Zyban will help kill both the depression and nicotine cravings. As I said, after 10 days of being quit, I tried it and it IMMEDIATELY helped a lot.
Good luck to you all.