I am undergoing treatment for breast cancer and I live in a privately owned flat. The problem I have is the smell of cigarette smoke from the flat downstairs. I am worried that this will harm me and cause my cancer to spread elsewhere. My husband smokes too, he does always smoke outside, but he does smoke around me when we are outside together and I wondered if anyone else had the same problem and what if anything they did about it. My mother died from lung cancer which was caused by passive smoking.