It might be time to rethink that little pill in your medicine cabinet. A new study casts doubt on the idea that regularly taking an over-the-counter painkiller can help ward off colorectal cancer -- at least for the general population.

Q. I'm 76 years old, and I've taken an aspirin every day since I was 28 because of arthritis. Although cancer runs in my family on both sides, I've never had cancer of any sort.