Diseases such as diabetes, kidney disease, chronic alcoholism, multiple sclerosis, atherosclerosis, vascular disease, and neurologic disease also cause
erectile dysfunction.
Lifestyle choices that contribute to heart disease and vascular problems also raise the risk of erectile dysfunction. Smoking, being overweight, and avoiding exercise are possible causes of erectile dysfunction". You can get more information through this link http://kidney.niddk.nih.gov/kudiseases/pubs/impotence/index.