Below is the picture of a healthy lungs and a smoker lungs.
Smoking is bad for your health and if you smoke you have a bigger risk from illness and worst early death. It is a known fact that the connection between smoking and lung cancer is well established. Quitting is indeed hard, but have the will power to do it. If the picture is not enough to convince you to quit smoking, then just think about your kids and your loved ones. If you can do it for yourself, just do it for them.