The radioactive elements formed by radon can be inhaled into our lungs. When inside the lungs, these elements continue to emit radiation that cause localised damage which can lead to lung cancer.
Radon causes over 1,100 deaths from lung cancer each year in the UK. Half of these deaths occur among those who are current smokers.
The higher the radon levels and the longer the exposure to it, the greater the risk - especially if you smoke.