You are not logged in.
Women who smoke just 100 cigarettes in their lifetime are '30% more likely to get breast cancer'
Women who smoke a pack a day are 60% more likely to get the disease
The figures relate to the risk of the most common type of breast cancer
This is known as oestrogen receptor-positive breast cancer
The link between smoking and the cancer could be because substances in cigarettes act like oestrogen - which promotes the growth of cancer