Yes, stopping smoking can cause water retention. There are a variety of reasons as to why. Suffice it to say it is a normal event and it will go away in time as your body adjusts to life without the poisons from smoking. This swelling may cause you to be cranky or depressed by the increase in weight (remember a gallon of water weighs eight pounds) or by the discomfort caused by water retention swelling. If you can, discuss options with your doctor or just ride it out. It really is a small price to pay for being smoke free.
Quitting smoking also affects your circulation. Once you quit, your body starts to heal and part of that means improved circulation. This can lead to itchiness, tingling or numbing feelings, and joint pain. The best advice I can give is to walk through the pain and try to remind yourself that this is the benefit of stopping smoking in the long run.
I stopped smoking and went through many of the symptoms you folks are mentioning. I was worried at first, but as I read more and talked with my doctor, I realized that this is just the temporary penalty we pay after a lifetime of smoking and it is a small price to pay to be smoke-free. Your body will adjust and recover and you will be better than ever. Keep it up!