Children’s Environmental Health in Michigan
Respiratory Health and Asthma: Second Hand Smoke (Repiratory Health)
From Michigan Network for Children's Environmental Health
Indoor air quality is an important indicator of children’s environmental health. Children spend approximately 80-90% of their time indoors. Exposure to indoor air contaminants including second hand smoke, mold spores, and volatile organic compounds may result in adverse health impacts (AAP 2003). The following two sections of this chapter will investigate these pollutants, provide analysis of the effectiveness of policy measures in Michigan and other states and recommend best practices for addressing indoor air quality issues in Michigan.
Second Hand Smoke
“Secondhand smoke (SHS) contains at least 250 toxic chemicals, including more than 50 that can cause cancer (Harris et al. 2009).” The U.S. Environmental Protection Agency and the International Agency for Research on cancer have both classified SHS as a known human carcinogen. Second hand smoke exposure has been associated with an increased risk of lung cancer development for nearly three decades (Asomaning et al. 2007). Nearly 60% (22 million) of children in American, aged 3-11 years, are exposed to second hand smoke (Harris et al. 2009).
This section provides background information on the presence and potential health effects of second hand smoke and reviews existing Michigan policies related to environmental tobacco regulation. Best policy practices from other states are highlighted and recommendations are provided to further protect Michigan’s children from exposure to second hand smoke.
Secondhand smoke (SHS) causes numerous negative health effects, including neurotoxicity, respiratory disease and cancer. According to the U.S. Surgeon General exposure to SHS can cause lung cancer, heart disease, and respiratory effects in nonsmokers, and increase the risk of Sudden Infant Death Syndrome (SIDS), acute respiratory infections, ear problems, and more severe asthma in children (USDHHS 2006) and therefore will be discussed in all chapters of this report.
This section discusses the asthma and respiratory health effects of SHS exposure. Other sections detail the neurotoxic and respiratory effects of SHS exposure, present leading policy practices from other states (including laws and policies providing for smoke-free indoor air and tobacco prevention efforts), and provide policy recommendations on how to minimize childhood SHS exposure in Michigan.
Sources of Second Hand Smoke
Secondhand smoke (SHS) consists of both “mainstream smoke,” the smoke exhaled from the person smoking and “sidestream smoke,” the smoke emitted from the burning end of a tobacco product (NCI 2007). SHS is also commonly referred to as “environmental tobacco smoke” (NCI 2007). In the U.S., cigarettes are the predominant source of SHS, followed by pipes and cigars (NCI 2007). Cigarette smoking releases a complex mixture of toxicants including nicotine, carbon monoxide, and cyanide (GBPSR 2000). Over 4,000 different compounds have been identified in tobacco smoke, and at least 250 of these chemicals are known to be toxic or carcinogenic (USDHHS 2006) The composition of SHS is influenced by many factors including the type of tobacco, the extent of chemical additives to the tobacco, the type of paper used to wrap the tobacco, and the way the tobacco is smoked (NCI 2007).
Asthma and Secondhand Smoke
Children are more vulnerable to the effects of secondhand smoke (SHS) because their bodies are still developing. Additionally, children breathe in significantly more air per unit body weight than adults, meaning that they may have higher rates of exposure to SHS than adults (Landrigan 2004). Exposure to SHS can cause asthma in children who previously did not show symptoms, and can also trigger asthma attacks and create more severe symptoms in children with existing asthma (EPA 2011). A 1992 report by the U.S. Environmental Protection Agency estimated that between 200,000 and 1,000,000 asthmatic children have had their condition worsened by exposure to SHS (EPA1992). There are a number of mechanisms through which SHS exposure might contribute to asthma, including SHS-mediated effects on the immune system, changes to neural reflexes controlling the airway, and induction of bronchial hyper-reactivity (USDHHS 2006). One study found that asthma severity in asthmatic children increased with parental smoking, and that children exposed to tobacco smoke in the home also had more allergic manifestations than those who were not exposed (Radic et al. 2011).
In addition to asthma, SHS exposure in infants and children under six has been linked to bronchitis and pneumonia (EPA 2011). Furthermore, babies whose mothers smoked during pregnancy or who are exposed to secondhand smoke after birth have weaker lungs than unexposed babies, increasing their risk for many respiratory health problems (USDHHS 2006). Children exposed prenatally may develop persistent respiratory problems due to morphologic and metabolic changes once SHS crosses the placenta, and also due to structural changes in the developing lung (USDHHS 2006). Moreover, SHS exposure has been causally associated with an increased risk of Sudden Infant Death Syndrome (SIDS) and evidence suggests an association between early-life SHS exposure and a variety of childhood cancers (USDHHS 2006).
Childhood Exposure to SHS
- Please see: Neurotoxicity: Second Hand Smoke
Policy Summary and Analysis
- Please see: Neurotoxicity: Second Hand Smoke
Summary of Policy Recommendations for SHS in Michigan
- Please see: Neurotoxicity: Second Hand Smoke
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