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Can Your Neighbour’s Cigarette Smoke Harm You? The Hidden Risks of Second-Hand Smoke

You may not smoke. You may even avoid smoky restaurants, insist that nobody smokes inside your home and consider yourself safely away from tobacco. But what happens when the person sitting next to you lights a cigarette?

That familiar smell drifting across a balcony, into a car, through a window or across a tea stall is not “just smoke”. You are breathing in second-hand smoke- a mixture of smoke from the burning cigarette and smoke exhaled by the smoker.

And there is no completely safe level of exposure.

People often underestimate second-hand smoke because they are not the ones holding the cigarette. But the lungs and blood vessels do not distinguish between a smoker’s cigarette and smoke forced into the air around them.

Cigarette smoke contains more than 7,000 chemicals, including dozens known to cause cancer. For non-smokers, repeated exposure has been linked with lung cancer, heart disease and stroke. Even short-term exposure can affect blood vessels and trigger inflammatory and respiratory changes.

The Indian numbers make the issue harder to ignore. Data from the Government of India’s Global Adult Tobacco Survey (GATS-2) found that 35% of non-smokers were exposed to second-hand smoke at home. Among non-smokers working indoors, 26.2% reported workplace exposure. Public transport was another important source of exposure.

Children can be particularly vulnerable. Exposure can increase the risk of respiratory infections, ear infections and asthma attacks, while exposure during pregnancy can also affect the baby.

So, can your neighbour’s cigarette harm you? Yes- particularly when exposure is frequent or prolonged.

The practical answer is not to panic over every whiff of smoke, but to reduce exposure wherever possible. Keep homes and cars completely smoke-free, move away from active smoking and avoid assuming that an open window or designated smoking corner makes exposure harmless.

Because when someone else lights a cigarette, you should not have to light one too to pay the health price.

Don’t smoke? You still have a reason to avoid tobacco smoke. Learn how to reduce second-hand smoke exposure at home, work and in public places.

Dr. Ritu Dave
DNB DNB ECMO
Consultant Cancer Physician
MOC Cancer Care & Research Centre, Shivaji Nagar.