Hi M1ke...
Some people here do report feeling lousy, and have physical problems after they quit. I had problems myself with pain issues, but since I had just been diagnosed with a thyroid problem, I thought it was that. (I think now it was a combo of both quitting and my hypothyroid). When I had a relapse and started smoking again, all of my pains improved significantly. But I still wanted to quit, no matter what! I smoked for 30+ years myself.

These same types of issues come up on this board often, and on the thyroid board, when people there have quit. Smoking is known to "mask" pain, and I truly believe that is true because of my own painful experiance. It's now been almost 2 years that I quit and I'm feeling pretty darn good. Oh, I still have some back pain, and this and that, but nothing like the pain I was going through before. It took me a good 18 months to start feeling human again, but please don't forget, I also have a thyroid problem and an autoimmune disease. All I can say is, just keep encouraging your dad to keep quit his going, and maybe do some things to improve his health, over all...better diet habits, supplements, daily exercise, meditation, proper sleep. I think the stress involved is hard on the body also. Possibly have him talk to his Dr. about this...maybe they can prescribe something that might help him. If I had to do it all over again, I think I would've got on an antidepressant, for a year or so. Please tell him to hang in there though, it is SO worth it! In the long run, he'll be glad he did, and will start feeling great, even better, once again.

Good luck...
Deda