Aspirin has been a mainstay in the treatment and prevention of cardiovascular disease for decades. We know that in patients who have had a heart attack in the past aspirin prevents a second heart attack, and during a heart attack aspirin is life-saving.  We also know that in patients with a prior stroke aspirin prevents further strokes.  And in patients with symptomatic narrowing of the arteries, that is chest pressure with exertion (angina) or calf pain with walking (claudication), aspirin pre...