I am a 58 years old male. 3 years before I was diagnosed to have been suffering from cad (with major blockage on the rad). I was given medicines but not put on angioplasty. I was a chain smoker but have totally given up smoking since then. I am working and plan to carry on for a few more years. However, I seem to have erectile dysfunction for the past 3/4 years and not able to have sex with my wife. Is this due to the cardiac problem? I am prescribed bp and blood thinning medicines.