What Twenty Years of Kitchen Smoke Does to the Lungs of Indian Cooks, Halwais and Dhaba Workers

A halwais working a tandoor at full heat is inhaling combustion gases, particulate matter, and vaporised fat simultaneously. A dhaba cook frying on a tawa over a wood or LPG flame produces a mix of carbon monoxide, nitrogen dioxide, polycyclic aromatic hydrocarbons, and fine particulate matter, PM2.5 and smaller, that penetrates deep into lung tissue on contact. These are not trace amounts. A 2013 study published in the journal Thorax measured PM2.5 concentrations inside Indian restaurant and dhaba kitchens and found levels routinely exceeding 500 micrograms per cubic metre during peak cooking hours. The WHO's safe threshold is 15 micrograms per cubic metre for a 24-hour mean. Kitchen cooks are crossing that threshold before the lunch rush ends.
The respiratory system has defences. Cilia sweep particles up and out. Macrophages in the alveoli engulf foreign matter. But those systems are calibrated for ordinary ambient air, not the sustained particulate load of a professional kitchen operating six or seven days a week. Over years, the cilia become less effective. Macrophages accumulate faster than they clear. Chronic bronchitis develops, a persistent cough producing mucus that many dhaba workers normalise as occupational noise, not a symptom. A 2019 study in the Indian Journal of Occupational and Environmental Medicine examined lung function in male cooks with more than ten years of kitchen exposure and found a statistically significant reduction in FEV1 (forced expiratory volume in one second) compared to age-matched controls. The reduction was comparable to that seen in moderate smokers. These were non-smoking cooks. The kitchen was doing what cigarettes do, just more slowly and with less social recognition.
Respiratory damage gets most of the attention, but smoke exposure in Indian kitchens does not stop at the lungs. Prolonged exposure to cooking smoke is a documented risk factor for cataract formation. Research from the All India Institute of Medical Sciences has identified biomass and solid-fuel cooking smoke as a contributor to oxidative stress in the lens of the eye, accelerating the clouding that leads to cataract. Halwais who work over open coal or wood fires for years frequently report deteriorating vision in their forties, often attributed to age rather than occupation. The cardiovascular picture is similarly grim. Fine particulate matter absorbed through the lungs enters the bloodstream. Once there, it promotes systemic inflammation, raises blood pressure, and accelerates arterial plaque formation. A cook's health risk from kitchen smoke is not confined to the organ doing the breathing.
Most of the occupational health framework in India was built around factories and mines. A dhaba kitchen with four cooks and a tandoor does not trigger the inspection thresholds or safety obligations that govern larger industrial workplaces. Exhaust hoods, if they exist at all, are rarely maintained or correctly positioned. Masks are almost never provided, and in high-heat kitchen environments, standard surgical or cloth masks offer negligible protection against PM2.5. Halwais in particular often work in enclosed, poorly ventilated spaces where the smoke from a morning's worth of deep frying has nowhere to go. The workers who bear the highest exposure, those on the tandoor or the open wok station, are typically the lowest-paid and least likely to have access to health insurance or regular lung-function screening. By the time a dhaba cook presents to a doctor with a respiratory complaint, the structural damage to the lung is usually years old.

The cooks feeding hundreds of people a day are absorbing, over twenty years, a cumulative respiratory and cardiovascular burden that the people eating their food will never share. The smoke that flavours the dal carries a cost, and it is paid entirely by the person standing in it.