The short answer is yes, they can make a meaningful difference to risk, but as ever with cancer, the long answer is that there are a lot of risk factors and the

The short answer is yes, they can make a meaningful difference to risk, but as ever with cancer, the long answer is that there are a lot of risk factors and they aren't the same from one type of cancer to another. I'm not a medical expert, just someone who's supported cancer research for a long time and has a lay person's understanding of the issues, so I'll leave it to more knowledgeable people to comment any further.