The article talks about a surprising increase in lung cancer cases among non-smokers, with experts suspecting air pollution as a leading cause. They found that patients who have never smoked now make up a greater number of lung cancer cases globally, with exposure to air pollution being a significant factor. Researchers believe that even small amounts of pollution from traffic and fossil fuels can increase the risk of lung cancer. Additionally, the article mentions that the risk of air pollution-related lung cancer is particularly high in countries such as China, where cities are often blanketed by smog. They also highlighted that as smoking rates decline globally, it is becoming increasingly important to study how lung cancer develops in non-smokers. Furthermore, the article touches upon the symptoms of lung cancer, such as a persistent cough, repeated chest infections, coughing up blood, and unexpected weight loss. It also mentions that the disease kills around 35,000 people in the UK each year and that rates of lung cancer have decreased by 9% since the 90s. Overall, the article raises awareness about the growing issue of lung cancer among non-smokers and highlights the importance of understanding the role of environmental factors, such as air pollution, in the development of the disease.