Of a person smokeson average a pack a day for ten years is there serious damage to the lungs and if I stop will the lungs repair themselves over time?

Yes, . Damage can always happen, in 2 years your COPD risk is similar to normal and in about 15 year risk of lung cancer is minimal.
Yes, Yes. Smoking at that rate is clearly associated with multiple health issues, including lung damage, heart disease, etc. Quitting produces some health improvements literally within days, and risk for major medical problems begins to decline within months of stopping. Heart disease and lung disease risk approach average population risk within a few years of quitting.