Lung cancer occurs when cancer cells grow uncontrollably in the lungs. The leading risk factor is smoking, but about 10-20% of lung cancers occur in people who have never smoked or have smoked fewer ...

Lung cancer remains the world’s deadliest cancer, and cigarette smoke is its chief culprit. Chemicals in tobacco, such as polycyclic aromatic hydrocarbons (PAHs), damage DNA and trigger the mutations ...