Radon, asbestos & occupational causes — lung cancer you can be exposed to at work

Occupational lung cancer is lung cancer caused, or strongly contributed to, by carcinogens that a person breathes in at work or in their environment rather than from smoking. The most important causes are asbestos, radon gas, crystalline silica dust, diesel engine exhaust, and metals such as arsenic, chromium and nickel. Many of these are classified as Group 1 carcinogens, meaning there is clear evidence they cause cancer in humans. Because the gap between exposure and cancer can be 15 to 40 years, occupational lung cancer is often diagnosed late, sometimes in people who have never smoked.

When asbestos is disturbed, its fine fibres become airborne and are inhaled deep into the lung, where they lodge in the tissue. Over years they cause repeated inflammation and scarring, and the accumulated damage to lung cells can lead to cancer. Asbestos causes both lung cancer and mesothelioma, a cancer of the lining around the lungs. Exposure happens in construction, demolition, shipbuilding, insulation, roofing and brake-lining work. In people who also smoke, asbestos multiplies the lung cancer risk many times over, rather than simply adding to it.

Yes. Radon is a colourless, odourless radioactive gas that seeps naturally from soil and rock and can build up indoors in poorly ventilated buildings, basements and ground floors. As it breaks down it releases radiation that damages the DNA inside lung cells. Radon is recognised internationally as the second-leading cause of lung cancer after smoking, and the leading cause among people who have never smoked. The risk depends on how much radon is present and how long a person is exposed in that space, and it is higher still when combined with smoking.

Yes. Inhaling crystalline silica dust — released during mining, quarrying, stone-cutting, sandblasting, and glass or ceramics work — damages the lung and raises lung cancer risk. Silica also causes silicosis, a serious scarring lung disease that itself increases the chance of cancer. As with other occupational carcinogens, the risk is cumulative: the higher the dust exposure and the longer it lasts, the greater the danger. Good dust control, ventilation and properly fitted respirators sharply reduce ongoing exposure in workers who handle these materials.

There is usually a long latency between exposure and diagnosis — often 15 to 40 years. This means a retired worker can develop lung cancer decades after leaving a job that exposed them to asbestos, silica or other carcinogens. Because so much time has passed, and because many of these patients have never smoked, lung cancer is often not the first condition suspected. This is exactly why your work and exposure history is important information whenever a persistent chest symptom appears, even long after retirement.

Watch for the same warning signs as any lung cancer: a persistent new cough lasting more than 3 weeks or a change in a long-standing cough, unexplained breathlessness, coughing up blood, persistent chest or shoulder pain, recurring chest infections in the same part of the lung, persistent hoarseness, and unexplained weight loss or fatigue. Early-stage lung cancer often causes no symptoms at all. Most of these symptoms have causes other than cancer, but in someone with a significant exposure history they should never be ignored, and a chest evaluation is sensible.

It depends on your overall risk. For some people with a heavy occupational exposure history — particularly if they also smoked — a specialist may recommend periodic low-dose CT screening to find any cancer at an early, more treatable stage. Screening is not right for everyone, so the decision should be made with a doctor who knows your full history. At a minimum, anyone with a meaningful exposure should know their history, stay alert to persistent chest symptoms, and seek a chest evaluation promptly if one appears.

Yes, often dramatically. For exposures such as asbestos and radon, smoking does not just add to the risk — it multiplies it, because the two sources of damage compound each other. This is why stopping smoking is especially valuable for anyone with a history of asbestos, silica or radon exposure: it removes the single factor that magnifies every other risk. Quitting lowers lung cancer risk at any age, and the benefit grows the longer a person stays smoke-free.

You cannot undo a past exposure, but you can lower your future risk and improve the odds of catching any problem early. The biggest single step is to stop smoking. Beyond that: use proper respiratory protection and dust control if you still work in a high-risk job, improve indoor ventilation to limit radon and indoor smoke, never disturb asbestos materials yourself, and act promptly on any persistent chest symptom. For higher-risk individuals, discussing screening with a specialist can help detect cancer at a more treatable stage.

Yes. CION Cancer Clinics evaluates and treats lung cancer in both smokers and non-smokers, including cancer linked to occupational and environmental exposures, across Hyderabad. The 45-minute consultation includes reviewing your full work and exposure history. Every case is discussed by a tumour board of medical, surgical and radiation oncologists, molecular testing is arranged from the biopsy as standard, and a free written second opinion is available. CION operates 35+ centres across Telangana and Andhra Pradesh and is rated 4.8/5 by over 1,000 patients on Google.