Hi PatK, congrats on your quit! I gained about 10 pounds during the last 8 months since I quit. Part of this is other life stuff, and part of this is because, like many people, I used to actively use cigarettes to control my weight (ie: I would smoke instead of snack). I eventually had to get myself on board with the idea that ANY kind of weight gain would be worth quitting cigarettes. Once the quit is done and solidified, I can attend to the weight part at my leisure. Weight is something you can attend to any time you want, at any level of intensity you want. Around 6 months into my quit, I started focusing on my weight gain and I'm now just sort of taking it easy in getting myself back to my normal. It's already half gone after just a month or two of attention. My body and brain has adjusted to being a non-smoker, and now I can fine-tune other aspects of my health. The truth is, not a single person except me has even noticed the weight gain (and I am extremely short, so 10 pounds is proportionally a bigger deal to me lol), I look the same in photos as I did a year ago (unless I'm using a ridiculous level of scrutiny), and beyond all that I actually feel healthier now than I did last year since I no longer smoke. Even if I had to "pay" for my quit with a permanent 10 pound weight gain, it would be worth it. No one cares about it except me, so maybe I shouldn't care so much about it either.
Its just a change to our lifestyle, and we need to adapt to it. Honestly, only 5 pounds in almost three moths is great. Our body used to have to work harder coping with the nicotine and chemicals inhaled from a cigarette, and once we quit, it did not have to work as hard to maintain itself. That's also part of the reason we gained weight. 
