A variety of false theories about breast cancer risk factors cause unnecessary concerns for many women. Many have been studied and found to not have any impact on breast cancer risk.
These are among those factors:
Antiperspirant and deodorant use
Caffeine intake
Breast implants
Abortion
Exposure to environmental contaminants such as Polychlorinated Biphyenls (PCBs)
Living near electromagnetic fields
Trauma to the breast