Erectile Dysfunction (ED) is a common public health problem affecting millions of men worldwide. It has a strong negative effect on interpersonal relationships, well being and quality of life. Smoking is a major public health problem Worldwide and its effect on sexual life and ED is an often-used fact in Stop Smoking campaigns. The link between smoking and ED has been discussed in many studies. Few studies have looked or published findings on the effect of smoking on ED or the effect on ED by stopping smoking. We look at a study that tries to better understand the mechanisms between smoking and ED.