Smoking increases the risk of erectile dysfunction by around 50% for men in their 30s and 40s. According to Action on Smoking and Health (ASH) and the British Medical Association (BMA) estimate that up to 120,000 UK men in their 30s and 40s are impotent as a direct consequence of smoking. This figure is likely to be an underestimate, because it does not include impotence due to previous smoking in men who no longer smoke.Polling undertaken by MORI for ASH in March 1999 revealed that only 13% of male smokers considered smoking as a cause of male impotence.