I was a very heavy smoker. i stopped smoking nearly 10 years ago. will my lungs have recovered to what they were like before i started smoking?

Not completely: Congratulations on having stopped smoking. By now you should have experienced a significant improvement in your ability to breathe. Your lungs will not return entirely to normal but they will improve greatly. You have also greatly cut down on your risk of copd, emphysema, and lung cancer. Always remindi your doctors however that you were at one time a heavy smoker. Unfortunately you still remain at risk of developing cancer because of the amount you did smoke. However, that risk is greatly reduced by having quit. It's just that the risk does not drop to zero.

Smoking: Congrats on sustained cessation of smoking! it is probably one of the most difficult addictions to stop. The amount of "recovery" of lung function depends on several factors, such as number of years of smoking, number of packs per day, amount of emphysema present, other toxins to the lungs (ie. Occupation exposures), and other health issues such as heart disease which is common in smokers.

No, but...: When you made the decision and carried through with quitting 10 years ago, it was a very wise choice in regards to the health of your lungs. It should give you extra years of quality life, specifically a lower need for medications for smoking associated disease and the ability to be physically active longer. Congratulations!