Well congrats! 
I know you can do it. I've been in the same boat before. I only smoked for 8 years fortunately, but whether it's 8 years or 43 years, the fact is you can still quit. It may be hard, it may be stressful, but it is totally worth it. I've been off cigarettes for 4 years nearly, and I can say it feels great!
If your up to 2 packs a day, what I'd suggest is slow your intake down to 1 pack, then half a pack. By the time you're at half a pack, you should have no problem quitting cold turkey (if thats the route you want to go... that's how I did it, but never everyone has the will power to do it, and that's ok too 
).
What you don't want to do is go from 2 packs a day to 0 just like that. It can make your body very sick and your body can go into shock because your neurotransmitters in your brain (dopamine, saratonin, etc...) are used to being fed off the chemicals in the cigarettes; most dominantly nicotine, but that's not only big player in the equation of course.
What may benefit you is a smoking cessation class if you have the time. I don't know if those classes cost anything, but you could certainly look those up. Those can really help get you in the right mindset to lower your intake, and take control of your body, taking control from the chemicals, as half the addiction is all mental, but there is that chemical bond that the neurotransmitters are fed off of too.
And I think setting a goal to acheive your result would be very beneficial also. So say I want to quit in 1 month let's say. So you'd set sub goals to get there. Your first sub goal could be say smoking 10 less cigarettes a day in 1 week. Then smoking 20 less cigarettes in 2 weeks, 30 in 3 weeks, and finally 40, or 2 packs in 4 weeks.
Something along those lines.
Whatever timeframe you give yourself, stick to it and stay true to yourself. And remember, if you need any encouragement, wisdom, or insight on the matter, please let me know. I know first hand how hard the battle with cigarettes are. It can be a very hard fight, and it takes every ounce of energy in your body to get through it, particularly the first phase of it. So I am more than willing to help keep you on the right track when you have some doubts and/or you feel like quitting quitting 
.
And print that out in big bold letters, and put it everywhere you would smoke around the house, in the office, etc... "I WILL QUIT, I WILL QUIT!"
And I know if you put forth the effort, you certainly will quit.
Thanks,
Justin