They found that people who took a multivitamin, vitamin C or folate supplements had the same risk of lung cancer as those who took none.
However, among vitamin E users, people who took a higher dose had a greater risk of lung cancer.
The recommended amount of vitamin E is 15 milligrams a day. Many in the study were taking much more.
Experts say these findings show that just because they're natural, doesn't mean vitamins are harmless.
