Many things can cause erectile dysfunction like:

1. Heart disease

2. Clogged blood vessels (atherosclerosis)

3. High cholesterol

4. High blood pressure

5. Diabetes

6. Obesity

7. Metabolic syndrome - a condition involving increased blood pressure, high insulin levels, body fat around the waist and high cholesterol

8. Parkinson's disease

9. Multiple sclerosis

10. Certain prescription medications

11. Tobacco use

12. Peyronie's disease — development of scar tissue inside the penis

13. Alcoholism and other forms of substance abuse

14. Sleep disorders

15. Treatments for prostate cancer or enlarged prostate

16. Surgeries or injuries that affect the pelvic area or spinal cord

Smoking can interrupt blood flow to your penile region resulting in diminished libido and cause erectile dysfunction or impotence. That is the reason why ED is often a precursor to other blood circulation and heart problems. Smoking is something that you definitely quit to help you get rid of impotency. It has a lot of other benefits as well.

Depression is one of the major factor for erectile dysfunction. It can stop your sexual desire mentally so when you want to perform sex you cant meet up the level of expectation.