How does alcoholism affect chemotherapy for breast cancer?

Varies: Alcoholics may have liver dysfunction or vitamin deficiencies which could worsen the effects of chemotherapy.

In many ways: Alcohol, in excess, can adversely effect every organ in the body, except the kidneys. Chemotherapy can be quite damaging to the organs as well and may interfere with how the various drugs are metabolized and broken down by the liver. I suggest that you check out: www.Aa.Org. Good luck.