Congratulations for the two years of your smoke free life. i am sure that your body must have healed itself on its own to a great extent with no more poisonous smoke to bear anymore. It is good to be repelled by tobacco, and even when such feelings subside, our reason must always be one anti tobacco. You must work for the better health just like a normal young guy who is a non-smoker and yet he aims to make his health better through proper diet and exercise. Make sure you enjoy your life when the curse of cigarettes is gone now., especially go for hiking, swimming, etc. Some people claim the feelings of just being born fresh again, after they overcome this habit However, you must never get carried away and always stay firm on your decision, however old it may get with time, Not to smoke ever because sometimes a small slip, a small one puff may take you again into the trap. wish you all the best for your future. Have a healthy, smoke free and happy life!