It's hard for me to tell the difference between an urge and just a thought about having a smoke. I don't feel I have had any real urges or cravings to smoke in some number of months but do I still have thoughts about smoking .... yes I do. I think we always will just because we were once smokers. It will never be like you didn't ever smoke. Not possible to erase those imprints on your brain but, the longer we go without smoking, the easier it gets to manage those thoughts.
When we start out in our quit we are so focused on how bad smoking is for us and how it isn't our friend and does nothing good for us but then, as our quits become more mature, those negative impressions of smoking fade somewhat and memories of how we thought smoking was so satisfying back in the day can start to creep into your brain again. Ah yeah! Maybe just one for old time sake? A couple of puffs won't hurt cuz I've been quit now for over a year so I'm no longer addicted really. I don't know how many times that very reasoning has been the cause of a relapse for a long term quitter. Allowing yourself to get into that mindset were you start romancing the cigarette even just a little is the most dangerous thing you can do after a long term quit.
It's not hard at all to stay quit after awhile but it's very easy to relapse if you don't control your thoughts about smoking. Instead of thinking how we could have just one, think about how devastated you would feel immediately after having just one. That's the reality!