There are usually two aspects of substance dependency that must be adequately addressed if you're going to be successfully in quitting: the physiological aspects and the psychological aspects of the addiction.
Most of the posters thus far have given you advice that address the psychological aspects of the addiction. While those are helpful and may be enough to help someone quit smoking who isn't highly addicted physiologically to nicotine, they'll ultimately be insufficient for those who are. You, my friend, seem to be thoroughly addicted physiologically, considering your withdrawal symptomatology (e.g., feeling physically ill after only a few days without cigarettes). So, I'd imagine it's going to take more than lollipops and chewing gum to help you kick the habit.
When I quit smoking, I used buproprion. That drug is marketed under the name Wellbutrin as an antidepressant and Zyban as the anti-smoking drug. It's the same drug, though - buproprion - in both, just different trade names (so that the drug companies can maximize profits). Anyway, it worked wonders for me. You take the drug and continue smoking as though nothing has changed. About five days in, cigarettes started tasting nasty. You know that last cigarette you smoke at 4am after you've smoked like a pack-and-a-half, the one that tastes terrible? That's what all the cigarettes started to taste like, even the cigarettes that usually taste really good (e.g., the first one in the morning, the one right after a meal, the one right after sex). About seven days in, I started forgetting that I needed to smoke. You know how your body starts geeking for a cigarette about every hour? Well, for me, it was like my body forgot to remind me that I needed to stop what I was doing and go smoke, and before long I was going like two and three hours between cigarettes. About 10 days in, smoking cigarettes started to make me feel physically ill, and I just became aversive to them. I know, after about 10 solid years of smoking a pack a day, and many, many failed attempts to quit smoking, I just simply lost the physiological urge to smoke. It was heaven. I threw my cigarettes away just like that and started what amounted to a new life. (I also put on - no lie - eight pounds in the week after I quit. Nicotine is a powerful stimulant, so it ramps up our metabolism and kills our appetite. If you're concerned about putting on weight - and, OP, I know you are - then quitting smoking is one of, and perhaps THE best thing you can do.)
There are plenty of people who have used buproprion and been unsuccessful, so it's not a wonder-drug for everyone. But, for me, it was just the thing I needed to break the physiological component of my addiction that was keeping me from quitting for good. At this point, I'd advise that you make an appointment with a primary care physician, let them know you want to be prescribed something to quit smoking, and discuss your options. I'm also fairly sure they've released another medication for smoking cessation, though I'm not as informed about that one as I am the buproprion.
The psychological components to addiction can be powerful as well, and I'd advise you to be prepared for those as well. For me, quitting smoking was like breaking up with a girl that I had dated for a really long time. Think about it, when you smoke, cigarettes are always there for you. In the morning when you wake up, when you're stressed, when you're happy and celebrating, when you go to bed, when you're sad, when you're bored, when you're at work or on vacation - you get the picture. So, when cigarettes go away for good, it's almost like you're ending this really long, really significant relationship. Be prepared to mourn a little, and be prepared to occupy yourself with other activities. Think about it - you've just eliminated something from your life that you used to plan your life around. With it gone, you'll have a void, so you'll need to find something to fill that void. For you, I'd imagine exercise should be what you use to fill the void - get your ass in the gym and get your flex on.
Okay, that's my two cents. I hope it helps. Keep in mind that not only is nicotine one of the most addictive substances physiologically (and, in fact, is - as some studies contend - as addictive physiologically as cocaine and heroin and those drugs we consider the "heavy hitters"), but studies consistently demonstrate that the person who is successful in quitting smoking usually has tried and failed to quit smoking several times before. So, statistically, you're where you need to be. Also, based on what you've said, it sounds like, psychologically, you're at a point where you're ready to quit for good.
Good luck.