I'm not sure I had urges to smoke the first while after I quit. Wanting to smoke was like just a constant thing occupying my mind. So much so that the first week or so I could barely function at day to day life. As Bat said, you just do whatever you have to do to get through that part of your quit. As D said, you are stronger than that feeling of needing to smoke - believe it, you ARE. You just have to want it badly enough to get through it. It's not comfortable. It's not pleasant but it's so worth it once you get through that stage of your quit. Also, that's why you must never take even one puff because that will make you relapse and then you have to start all over again.
Look at my ticker thing below. I have only been quit for just over 1 month so what you are going through is still VERY fresh in my mind. It sucks big time I know, I was just there recently. I can also tell you that it is not like that for me now. Sure, I still think about smoking here and there. Quit a bit actually but it isn't constant any longer and it's a lot easier to distract myself and just move on from those thoughts much more easily than it was initially. You will get to that point too. We all do. There's no set time frame as everyone progresses differently but what you are feeling right now will gradually get better and better. You just have to want it badly enough to get there ;)