Exposure to radon gasRadon gas is a

Exposure to radon gas
Radon gas is a naturally occurring radioactive gas which comes from tiny amounts of uranium present in all rocks and soils. The radon gas can build up in homes and other buildings. The highest levels have been found in south west England, but higher than average levels may be found in many other parts of the UK.

Radon is one of the biggest causes of lung cancer after smoking. The risk from radon increases the risk from smoking. Smokers with high indoor levels of radon have a particularly high risk of getting lung cancer. So if you live in a high radon area, it's even more important to stop smoking. If you are worried about this, UK Radon has information and advice, including how to check radon levels in your house.