It's a debate that has gone back and forth for years, but now US researchers say breast implants don't increase the risk of cancer.

The findings come from the Journal of the National Cancer Institute.

Researchers looked a cancer rates in nearly 35 hundred Swedish women who had implants for cosmetic reasons.

They tracked the women for 18 years in the longest follow-up study of its kind, and the number of cancers found was less than predicted for the group of women.

In an odd twist, however, the women with implants actually had an increased lung cancer rate.

The researchers say that it likely reflected the lifestyle and smoking habits of the women with implants, not the effects of the implants themselves.