Why that daily aspirin you take could be a fatal mistake: Millions believe it protects the heart. Now science has shifted dramatically – and doctors say too few know the risks. Special report by ETHAN ENNALS

It is better known as a painkiller – yet more than two million people in the UK swallow a low-dose aspirin every day in the belief it protects their heart.

For decades, the 125-year-old drug, which reduces the blood’s tendency to clot, was…