That’s because the studies show that aspirin doesn’t reduce the risk of dying from a heart attack or stroke
in healthy people. Furthermore, the potential risk
of a cerebral hemorrhage, gastrointestinal bleeding, and ulcers outweighs any heart benefits the aspirin might provide.
However, if you've already had a heart attack or stroke, or if you have been found by your doctor to be at high or moderate risk for heart attack or stroke, the benefits of taking aspirin can trump the risks.