Archive · 11 Aug 2026
Why more non-smokers in India are developing lung cancer
For a long time, doctors thought lung cancer mostly happened to people who smoke.
Now doctors in India are seeing many patients with lung cancer who never smoked.
In some Indian hospitals, about 4 or 5 out of every 10 lung cancer patients are non-smokers.
One big reason may be dirty air, because tiny pollution particles can hurt our lungs.
Cooking with certain fuels in rooms without fresh air, and breathing other people's smoke, can also be risky.
Some jobs where people breathe dust, like asbestos or silica, can raise the risk too.
Sometimes the instructions inside our bodies can make a person more likely to get lung cancer even without smoking.
Many non-smokers do not think they can get lung cancer, so they wait too long to see a doctor.
Smoking is still the biggest cause, but doctors say everyone should pay attention to their lungs and get checked early.
If someone has a cough that will not go away or feels very tired, they should visit a doctor.
Indian hospital studies show roughly 40-50% of lung cancer patients are non-smokers, though this is not a national prevalence estimate.
Air pollution, especially fine particulate matter (PM2.5), is a major risk factor; outdoor air pollution is a Group 1 carcinogen according to the International Agency for Research on Cancer.
Biomass fuels, poorly ventilated kitchens, second-hand tobacco smoke, and occupational exposure to asbestos, silica and diesel exhaust also increase risk.
Lung cancer in non-smokers is often adenocarcinoma and carries EGFR mutations at rates up to three times higher than in smokers, which affects treatment options.
Experts warn that non-smokers often delay diagnosis because they don't consider themselves at risk, while smoking remains the leading preventable cause.
- Who
- Dr Sourabh Pahuja, Senior Consultant, Pulmonary Medicine at Amrita Hospital, Faridabad, discussing Indian hospital studies showing many lung cancer patients are non-smokers.
- What
- A growing share of lung cancer patients are non-smokers, with risk linked to air pollution, indoor and occupational exposures, genetics, and delayed diagnosis.
- When
- Not specified in the articles.
- Where
- India, based on hospital-based studies and high environmental exposure levels.
- Why
- Lung cancer is no longer considered only a smoker's disease, so broader awareness of environmental and genetic risk factors is needed for early detection.
- Expert quoted
- Dr Sourabh Pahuja, Senior Consultant, Pulmonary Medicine, Amrita Hospital, Faridabad
- Non-smoker share in hospital cohorts
- Approximately 40-50% of lung cancer patients
- Key outdoor risk
- Fine particulate matter (PM2.5); outdoor air pollution is a Group 1 carcinogen per IARC
- Indoor and occupational risks
- Biomass fuels, poorly ventilated kitchens, second-hand smoke, asbestos, silica, diesel exhaust
- Common cancer type in non-smokers
- Adenocarcinoma with distinct molecular alterations
- EGFR mutations in non-smokers
- Up to three times higher than in smokers in some studies
- Largest preventable cause
- Smoking remains the leading preventable cause of lung cancer