My child has bronchiolitis: is it definitely because of smoking at home?

Not necessarily. Viral bronchiolitis (RSV) is very common in winter, regardless of smoking. But second-hand smoke makes it more frequent and more severe. If you smoke at home, it is one more factor.

We both smoke at home. How do we explain that to our children?

Be honest: "We smoke, we know it is also bad for you, and we are trying to quit. In the meantime, here are our rules: not in the house, not in the car." Children understand consistency very well — what they cannot stand is inconsistency.

Can I purify the air with a fan or a purifier?

No, it does not work. No consumer ventilation system effectively removes cigarette fine particles. The only measure that works is not smoking indoors.

My parents smoke when we visit. What to do?

Ask them politely but clearly: no smoke near the child, no smoking in the house during the visit. Most grandparents agree once you explain why. If they flatly refuse, shorten the winter visits, and stay in smoke-free rooms.

If I only smoke when my child is at school, is that OK?

Better than smoking in front of them, yes. But residues in the home stay toxic even when they come back. The "never indoors" rule applies even when they are out.

Passive smoking and children: concrete health effects and how to protect kids at home

Bronchiolitis, ear infections, asthma, cot death: what tobacco smoke actually does to children, and how to protect them — even if you cannot quit yet.

June 13, 2026 Aria

The scientific basis on quitting smoking was reviewed on a voluntary basis by Pr. Bertrand Dautzenberg , a tobacco specialist, in order to rule out gross, potentially dangerous errors. It reflects positions commonly shared by health professionals and health agencies, without always corresponding exactly to his thinking or his practice. He is not the author of this text; he has only carried out a vigilance review of it.

You smoke, but "not in the house". You smoke "on the balcony, window open". You smoke "in the car, window down". You assume your kids are protected. Spoiler: not really. Here is what the science actually says — and what you can concretely do, even if you cannot quit (yet).

Why are children more vulnerable?

A child's lung finishes developing around 8-10 years old. All that time, it is more sensitive than an adult lung to chemical assaults. Three reasons:

What smoke really does to children

Not to scare you, but to line up the facts.

Respiratory side

× 2 the rate of bronchiolitis, ear infections and respiratory infections on average among children exposed to second-hand smoke at home.

Paediatrics / WHO, consolidated data 2023-2024

In practice: more bronchiolitis in infants, more recurrent bronchitis, more pneumonia, more repeat ear infections. The last can delay language learning if they pile up.

Asthma side

For asthmatic children, second-hand smoke multiplies attacks and worsens their severity. For those who are not asthmatic, regular exposure increases the risk of developing it.

Infant side

ENT side

Chronic serous otitis, recurrent rhinopharyngitis, raspy voice — common but far from harmless if they keep coming back at age 3.

Long-term side

Exposed children carry an increased risk of adult lung cancer, even if they never smoke. And a higher cardiovascular risk in adulthood.

The balcony myth

One of the most stubborn — and most wrong — beliefs.

And the car? Worse still.

× 23 the peak in fine particles inside a car where someone smokes with the window open, compared with the extreme urban pollution threshold. Levels drop slowly, even after opening windows.

Toxicology studies on in-cabin air

Result: smoking in a car with a child on board is banned in the UK since 2015, even with windows open. It is a £50 fine in England and Wales. Similar laws exist in many European countries.

The 7 rules that really protect

If you cannot quit (yet), here are the concrete moves that genuinely make a difference:

100% smoke-free home. Not the kitchen, not the bathroom, not even the bedroom when the child is not in it. Always outside, really outside.
100% smoke-free car, always. Even when the child is not on board (particles linger).
No cigarette at the open window. Air drifts mechanically back inside. Step right out.
Change your clothes or wear a "smoking jacket" before picking up your child. Wash hands and mouth.
No co-sleeping when a parent smokes — the cot death risk is too high.
Ask guests not to smoke in your home, or only outside. You are within your rights.
Air out for at least 10 minutes once a day, even in winter. It lowers the concentration of residual particles.

Passive smoking is also…

A smoker exhaling smoke next to you: that is what we picture.
Smoke that drifts off the tip of a burning cigarette (the "sidestream"): that is what we forget. Yet 80% of the smoke from a cigarette ends up in the room — not in the smoker's lungs.
Residue deposited on surfaces (third-hand smoke).

So even if you "blow smoke away from the child", the cigarette burns on its own account too — and that smoke goes everywhere.

And vaping — is it better?

In United Kingdom

Your questions

My child has bronchiolitis: is it definitely because of smoking at home?

Not necessarily. Viral bronchiolitis (RSV) is very common in winter, regardless of smoking. But second-hand smoke makes it more frequent and more severe. If you smoke at home, it is one more factor.
We both smoke at home. How do we explain that to our children?

Be honest: "We smoke, we know it is also bad for you, and we are trying to quit. In the meantime, here are our rules: not in the house, not in the car." Children understand consistency very well — what they cannot stand is inconsistency.
Can I purify the air with a fan or a purifier?

No, it does not work. No consumer ventilation system effectively removes cigarette fine particles. The only measure that works is not smoking indoors.
My parents smoke when we visit. What to do?

Ask them politely but clearly: no smoke near the child, no smoking in the house during the visit. Most grandparents agree once you explain why. If they flatly refuse, shorten the winter visits, and stay in smoke-free rooms.
If I only smoke when my child is at school, is that OK?

Better than smoking in front of them, yes. But residues in the home stay toxic even when they come back. The "never indoors" rule applies even when they are out.

sources

WHO, Tobacco: second-hand smoke, factsheet updated 2024.
ASH UK, Secondhand smoke and children, briefing.
Royal College of Physicians, Passive smoking and children, report.
Cancer Research UK, Passive smoking.
UK Children and Families Act 2014 / 2015 regulations (ban on smoking in cars with under-18s).