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Vol. 30. Núm. 1.
Páginas 86-87 (Enero - Febrero 2016)
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Vol. 30. Núm. 1.
Páginas 86-87 (Enero - Febrero 2016)
Letter to the Editor
Open Access
Opinions on a car smoking ban: a needed guide for public health decision-makers
Opiniones sobre la prohibición de fumar en el coche: la guía necesaria para la toma de decisiones de salud pública
José Preciosoa,
Autor para correspondencia

Corresponding author.
, Fátima Reisb, Isabel Sousaa, Carla Sousab, José Machadoc, Luís Diasa, Catarina Samorinhad, Henedina Antunese
a Instituto de Educação, Universidade do Minho, Braga, Portugal
b Instituto de Saúde Ambiental, Instituto de Medicina Preventiva e Saúde Pública, Faculdade de Medicina da Universidade de Lisboa, Lisboa, Portugal
c Instituto de Ciências Sociais, Universidade do Minho, Braga, Portugal
d EPIUnit - Instituto de Saúde Pública da Universidade do Porto, Porto, Portugal
e Serviço de Pediatria, Hospital de Braga; Instituto de Ciências da Vida e da Saúde (ICVS); Escola de Ciências da Saúde da Universidade do Minho e Laboratório associado ICVS/3B's, Braga/Guimarães, Portugal
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Table 1. Agreement with a smoking ban in cars, with and without children, by city and smoking status of the respondents.
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To the editor:

About half of the children worldwide are exposed secondhand smoke (SHS) at home.1 Additionally, children are also exposed to SHS inside the vehicles in which they are usually carried, where smoking use results in high levels of SHS concentration.2 The largest study conducted in Portugal about children exposure at SHS in the car revealed that 28.9% of children had been daily or occasionally exposed to tobacco smoke inside cars.3

SHS exposure among children is associated with the development of respiratory infections and chronic symptoms such as cough, impaired lung growth and function, wheezing or dyspnea.1 Beyond the risks for children's health, evidence support the fact that children who live in a microsocial environment where tobacco use is a common behavior have an increased risk of becoming smokers.2 Also, on a different perspective, smoking while driving represents an increased risk of traffic accidents.

Laws banning smoking in cars carrying children have been introduced in a number of jurisdictions in the United States, Australia and Canada, and others, as the United Kingdom, will introduce a similar law in the near future. South Africa and Bahrain have bans on smoking in cars with children, while Mauritius has banned smoking in all cars carrying any passenger.4 Understanding the public opinion about the implementation of new policies is a needful guide for public health decision-makers.

Taking into account the lack of information on this important matter in Portugal, a study aiming to describe the level of agreement with a car smoking ban was developed. It consisted in a cross-sectional study with telephone interviews (based on the protocol of López et al.)5, conducted between May 2013 and October 2014, with a random and representative sample of the population of three Portuguese cities: Barcelos (Bar), Braga (Br) and Lisbon (Lx). The sample consisted of 129 individuals in Br (67 women), 85 in Bar (44 women) and 146 in Lx (74 women), proportional in city size, sex and age group. Overall, 360 individuals, aged between 15-74 years, were asked about their level of agreement on a nation-wide ban on smoking in cars–with and without children. Descriptive analysis was performed.

The majority of the participants supported a smoking ban in cars with children (85% Bar; Br 93%, 88% Lx). Non-smokers were more likely to support this policy (90% Bar, 100% Br, 90% Lx) than smokers (80% Bar, 76% Br, 77% Lx). Table 1 presents the agreement with a smoking ban in cars, with and without children, by city and smoking status of the respondents.

Table 1.

Agreement with a smoking ban in cars, with and without children, by city and smoking status of the respondents.

    Agreement with a smoking ban in cars
    With children  Without children 
  n (%)  n (%) 
Barcelos  77  69 (89.6)  68 (88.3) 
Braga  91  91 (100.0)  82 (90.1) 
Lisboa  115  103 (90.4)  63 (54.8) 
Barcelos  6 (75.0)  5 (62.5) 
Braga  38  29 (76.3)  13 (34.2) 
Lisboa  31  24 (77.4)  8 (25.8) 

A large public support to ban smoking in cars carrying children was shown. Raising awareness among parents and educators about the health consequences of tobacco use inside the car and encouraging them not to smoke indoors is an urgent need to promote smoke-free cars. Mainly, a ban on smoking inside cars would have immediate impacts on children's health protection. Results from this study strengthens the call for policy-makers to implement strategies to protect this fragile group, starting by banning tobacco use inside vehicles while carrying children.


This study was supported through FEDER from the Operational Programme Factors of Competitiveness–COMPETE and through national funding from the Foundation for Science and Technology–FCT (Portuguese Ministry of Education and Science) (FCOMP-01-0124-FEDER-009117).

Statement of authorship

The study was designed by J. Precioso, F. Reis and J. Machado. J. Precioso and L Dias wrote the first draft of the manuscript. I. Sousa and C. Sousa collected the data. J. Precioso and J. Machado designed and carried out statistical analysis. All authors gave a substantial contribution to the interpretation of data, critical discussion and revision of the manuscript, and approved its final version.

Conflicts of Interest



The authors gratefully acknowledge all the participants in the study.

WHO - World Health Organization. WHO Report on the Global Tobacco Epidemic: implementing smoke-free environments. Geneva: World Health Organization; 2009.
USDHHS-U.S. Department of Health and Human Services. The health consequences of involuntary exposure to tobacco smoke: a report of the surgeon general. Atlanta, GA: U.S. Department of Health and Human Services; 2006.
P.D. Vitória, J.C. Machado, S.B. Ravara, et al.
Portuguese children's exposure to second-hand tobacco smoke in the family car.
Gac Sanit., 29 (2015), pp. 131-134
Canadian Cancer Society. Laws banning smoking in cars with children – international overview. 2014. [Consulted on 14/04/2015]. Available at:
López MJ, Schiaffino A, Pérez-Ríos M, et al. Opiniones sobre la prohibición de fumar en espacios exteriores tras la ley de control del tabaquismo de 2011 (ley 42/2010). In: Congreso Iberoamericano de Epidemiología y Salud Pública; 4 September 2013. Granada, Spain. Gaceta Sanitaria; 2013; p.125.
Copyright © 2015. SESPAS
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