Smoking females increase their breast cancer risk by at least 30 per cent

Young women who have smoked at some point in their lifetime are around 30 per cent more likely to develop breast cancer than non-smokers, a new study has found, and those who smoke regularly increase their risk even further.

According to, researchers from the Cancer Research Centre in Seattle found that women who had smoked for at least 15 years were around 50 per cent more likely to develop oestrogen receptor-positive breast cancer - the most common type of breast cancer. Those that smoke, or have smoked, at least a pack of cigarettes a day for ten years increased their risk by 60 per cent.

Although a number of women in the study were diagnosed with triple-negative breast cancer, which is a particularly aggressive form of the cancer, the researchers found no link that suggested smokers are more likely to develop this form.

Dr Christopher Li, senior author of the study, said this research focused on how smoking increases the risk of certain forms of cancers.

"I think that there is growing evidence that breast cancer is another health hazard associated with smoking," he explained, reports "There is a growing appreciation that breast cancer is not just one disease and there are many different subtypes.

He added: "There are so many different chemicals in cigarette smoke that can have so many kinds of effects."