Aspirin is prescribed for some specific conditions due to its antiplatelet effect. From what I understand, for normal healthy people, there isn't much benefit of daily aspirin. And, there is potential for some side effects -- in addition to the same stomach problems / heartburn issues that plague other NSAIDS also has some bleeding type issues due to the antiplatelet effect.
Well, Bayer runs (or ran) ads encouraging just that behavior.
Such a thing would never fly in Europe. They'd get laughed out of the room and sued.
I'm not sure how that compares with other treatments or the average but offhand it seems pretty high to the point of asking whether it's worth it.
For patients with existing heart disease or prior strokes, the NNT is between 50 and 333 depending on the outcome you're considering. Source:
http://www.thennt.com/nnt/aspirin-for-cardiovascular-prevent...
For prevention of a first heart attack or stroke, the NNT is between 1667 and 3000 depending on the outcome. Notable is that no deaths were prevented by the therapy. Source:
http://www.thennt.com/nnt/aspirin-to-prevent-a-first-heart-a...