India's soaring levels of air pollution pose a huge threat to lung cancer among non-smokers.
Cooking fumes and asbestos have positive effects on indoor pollution which makes it a lung cancer factor for not only smokers but also non-smokers.
Secondhand smoke exposure among non-smokers is very common. This is one of the reasons for high lung cancer cases.
Many people are genetically predisposed to lung cancer regardless of whether they smoke or not.
Radon gas naturally occurring in certain areas can get into homes, an element that causes lung cancer.
Carcinogens in workplaces such as factories and construction sites make lung cancer more dangerous for non-smokers.