Most cases of cancer are down to unhealthy lives, rather than bad genes, doctors said last night.

They said that factors in the world around us, from diet, to sunlight, cigarettes and disease, play a far bigger role in fuelling cancer than dodgy DNA.

Up 90 per cent of cancer cases would be wiped up if all these triggers could be avoided.

Dr Emma Smith, of Cancer Research UK, said: ‘Healthy habits like not smoking, keeping a healthy weight, eating a healthy diet and cutting back on alcohol are not a guarantee against cancer, they do dramatically reduce the risk of developing the disease.’

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