Smoking increases the risk of developing certain types of cancer. It may also be associated with a higher likelihood of:

Treatment with in vitro fertilization (IVF).
Hormone replacement therapy
Factors that reduce the risk of ovarian cancer
For women at risk of ovarian cancer:

Having a child before age 26 (the risk decreases with each subsequent pregnancy).
Breast-feeding
Take birth control pills.
Temporary use of an IUD (intrauterine device).
Pelvic surgery includes a hysterectomy, which removes the uterus, tubal ligation, which ties the fallopian tubes, and removal of the ovaries.