My mom is 56 years old and has never had a mammogram.  She has a sister who was diagnosed with breast cancer about 7 years ago, and my mom blames past drug use on her sisters cancer.  I tried to advise my mom to go in and have a mammogram, or at the very least to do self exams, but she refuses saying that its not needed because she has never done drugs.  so my question to you would be... Does doing drugs up your chances/causes you to get cancer?  Also if drugs do impact the chances of getting cancer, is it still likely that it could run in your family?
Chat Doctor.  However, it does lower your immunity and so has an indirect effect on cancer risk. However, this does not mean that people who don't do