is breast augmentation can cause breast cancer?

Answer 1

To date, studies have shown no correlation between breast augmentation and breast cancer. Keep in mind though that many women who have implants are not at the typical "at risk age" at the time they have the transplants done.

From: http://www.fda.gov/fdac/features/995_implants.html
Another concern--increased risk of breast cancer--has not been borne out by studies. "Several studies have indicated there is no increased risk of breast cancer in women with implants," Brown says. However, she adds, these women are not yet in the age group that is more prone to breast cancer, and it remains to be seen whether they will eventually have a higher incidence of breast cancer than women without implants. Long-term studies to look at this are under way.

Answer 2

I was going to agree with ilse and add one thing. A study just came out today with those that have implants, there is an increase in suicide rates. Guess that has to do with self esteem and other related issues.