Maintaining good health, especially lung health, has three parts,  exercise, eating right and most importantly not smoking.  It is never too late to quit smoking.   The benefits are well worth it and experienced right away!  There are many tools to help you quit and stay quit.  Ask your doctor for a plan tailored for you.  It may be much easier than you thought.  There are so many options to help you.  Check it out!!  Tomorrow can be a better breathing day!!!