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Fumar pasivo

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You have an increased risk of lung cancer and heart disease if you are exposed to other people smoking for long periods of time.

At a glance

  • Passive smoking is breathing in other people's cigarette smoke.

  • Children exposed to passive smoke have an increased risk of infections, asthma, and cot death.

  • Adults exposed to passive smoke have an increased risk of lung cancer and heart disease.

  • Toxins from smoke can linger on clothes and furniture, still harming children.

  • If you smoke, always try to do so outside and away from others.

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If you smoke, one good reason to give up smoking is to benefit those who live and work with you. If you can't give up, you should make every effort to keep cigarette smoke away from other people, ideally by smoking outside.

To read more facts about smoking, see the separate leaflet called Quit Smoking (Smoking Cessation).

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Passive smoking risks

Children and babies who live in a home where there is a smoker:

  • Are more prone to asthma, and ear, nose and chest infections.

  • Have an increased risk of dying from cot death (sudden infant death syndrome).

  • Are more likely than average to become smokers themselves when older.

  • On average, do less well at reading and reasoning skills compared to children in smoke-free homes, even at low levels of smoke exposure.

  • Are at increased risk of developing chronic obstructive pulmonary disease (COPD) and cancer as adults.

Nicotine and other toxins can seep into clothing, soft furnishing, etc; a child does not have to be in a room or a car, while someone is smoking, to be harmed from the effects of their smoke.

Passive smoking of adults. You have an increased risk of lung cancer and heart disease if you are exposed to other people smoking for long periods of time. For example, the risk of developing lung cancer is increased by about 20-30% in people who are regularly exposed to other people's cigarette smoke. Cigarette smoke is also an irritant and can make asthma and other conditions worse.

Passive smoking in pregnancy

Smoking when you are pregnant can harm your unborn baby. Consulte el folleto separado titulado Embarazo y Fumar para más detalles.

The overall health impact of passive smoking is large. Although the health risks from passive smoking are small for the individual in comparison with the health risks from active smoking, the public health consequences of passive smoking are high due to the large numbers of people exposed.

For example, passive smoking by people living with smokers in the UK increases the risk of death from coronary heart disease by 50-60%. It is estimated to cause around 2,700 deaths per year in people aged 20-64, and a further 8,000 deaths per year among people aged 65 or older.

It is estimated that children breathing in other people's cigarette smoke resulted in 300,000 GP visits and 9,500 hospital admissions in 2011 in the UK. Up to five million children are thought to be regularly exposed to second-hand smoke in the home.

The results of a survey on children's views on smoking were published on the Department of Health's website. The survey revealed that children want smoke-free lives.

The survey found that:

  • 98% of children wished their parents would stop smoking.

  • 82% of children wished their parents wouldn't smoke in front of them at home.

  • 78% of children wished their parents wouldn't smoke in front of them in the car.

  • 41% of children said cigarette smoke made them feel ill.

  • 42% of children said cigarette smoke made them cough.

For information on how to stop smoking and the different treatments to help you stop, see the separate leaflet called Quit Smoking (Smoking Cessation).

Preguntas frecuentes

If I can't quit smoking, how can I best protect others from my cigarette smoke?

If you are unable to stop smoking, the most effective way to protect those around you is to ensure you keep cigarette smoke away from other people, ideally by smoking outdoors.

Can the harmful effects of passive smoking linger in the home even if no one is actively smoking at that moment?

Yes, nicotine and other toxic substances from cigarette smoke can seep into clothing, soft furnishings, and other items. This means that a child, for example, can still be harmed by the effects of the smoke even if they weren't in the room or car when someone was smoking.

What specific health problems can children develop if they are regularly exposed to passive smoke?

Children living in a home with a smoker are more susceptible to asthma, ear, nose, and chest infections. They also face a higher risk of cot death, and later in life, an increased risk of developing chronic obstructive pulmonary disease (COPD) and cancer.

Are there any impacts on a child's learning abilities from passive smoking?

Yes, children in homes with smokers tend to perform less well in reading and reasoning skills compared to those in smoke-free homes. This can occur even with low levels of smoke exposure.

What are the common health risks for adults exposed to passive smoking over time?

Adults who are regularly exposed to other people's cigarette smoke over extended periods have an increased risk of developing lung cancer and heart disease. For example, the risk of lung cancer can increase by about 20-30%.

How widespread is passive smoking exposure among children in the UK?

It is estimated that up to five million children in the UK are regularly exposed to second-hand smoke within their homes. Passive smoking by children also led to 300,000 GP visits and 9,500 hospital admissions in 2011.

What do children themselves think about their parents smoking around them?

A survey revealed that 98% of children wished their parents would stop smoking entirely. Additionally, 82% did not want their parents to smoke in front of them at home, and 78% did not want them to smoke in the car. Many children reported that cigarette smoke made them feel ill (41%) or caused them to cough (42%).

Lecturas adicionales y referencias

  • Smoking: harm reduction; NICE Public Health Guidance, June 2013
  • Cese del tabaquismo; NICE CKS, October 2012 (UK access only)
  • Hughes JR, Stead LF, Hartmann-Boyce J, et al; Antidepressants for smoking cessation. Cochrane Database Syst Rev. 2014 Jan 8;1:CD000031. doi: 10.1002/14651858.CD000031.pub4.
  • Wu J, Sin DD; Improved patient outcome with smoking cessation: when is it too late? Int J Chron Obstruct Pulmon Dis. 2011;6:259-67. doi: 10.2147/COPD.S10771. Epub 2011 May 2.
  • Cahill K, Stevens S, Perera R, et al; Pharmacological interventions for smoking cessation: an overview and network meta-analysis. Cochrane Database Syst Rev. 2013 May 31;(5):CD009329. doi: 10.1002/14651858.CD009329.pub2.
  • Hartmann-Boyce J, McRobbie H, Bullen C, et al; Electronic cigarettes for smoking cessation. Cochrane Database Syst Rev. 2016 Sep 14;9:CD010216.
  • E-cigarettes: an evidence update; Public Health England, August 2015
  • Cahill K, Lindson-Hawley N, Thomas KH, et al; Nicotine receptor partial agonists for smoking cessation. Cochrane Database Syst Rev. 2016 May 9;(5):CD006103. doi: 10.1002/14651858.CD006103.pub7.
  • Anthenelli RM, Benowitz NL, West R, et al; Neuropsychiatric safety and efficacy of varenicline, bupropion, and nicotine patch in smokers with and without psychiatric disorders (EAGLES): a double-blind, randomised, placebo-controlled clinical trial. Lancet. 2016 Jun 18;387(10037):2507-20. doi: 10.1016/S0140-6736(16)30272-0. Epub 2016 Apr 22.
  • Hackshaw A, Morris JK, Boniface S, et al; Bajo consumo de cigarrillos y riesgo de enfermedad coronaria y accidente cerebrovascular: metaanálisis de 141 estudios de cohorte en 55 informes de estudio. BMJ. 24 de enero de 2018;360:j5855.
  • Reid RD, Pritchard G, Walker K, et al; Managing smoking cessation. CMAJ. 2016 Dec 6;188(17-18):E484-E492. doi: 10.1503/cmaj.151510. Epub 2016 Oct 3.
  • Cao S, Yang C, Gan Y, et al; The Health Effects of Passive Smoking: An Overview of Systematic Reviews Based on Observational Epidemiological Evidence. PLoS One. 2015 Oct 6;10(10):e0139907. doi: 10.1371/journal.pone.0139907. eCollection 2015.

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About the authorView full bio

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Dr Colin Tidy, MRCGP

Médico General, Autor Médico

MBBS, MRCGP, MRCP (Paediatrics), DCH

Dr Colin Tidy is an NHS Doctor, based in Oxfordshire.

About the reviewerView full bio

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Prof. Cathy Jackson, MRCGP

Medical Author

BSc (Hons) Physiology, MB, ChB, MRCGP, MD

Professor Cathy Jackson graduated from Manchester Medical School having gained a first-class honours degree in physiology along the way.

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