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HomeMy WebLinkAboutHANDOUT FROM 03.16.2026 BOH MEETINGsecondhand smoke, also known as environmental tobacco smoke (ETS) or passive smoking, poses significant health risks to companion animals, including dogs and cats. The harmful effects are attributed to the inhalation of heated air and combustion products, as well as oral ingestion of particulate matter deposited on f ur and surfaces during grooming [1][2]t31. pets are particularly susceptible due to their close proximity to the floor where toxins settle and their grooming habits[3]. Effects on Cats cats exposed to secondhand smoke have an increased risk of developing certain cancers and respiratory issues. Cancer Malignant Lymphoma: cats living in households with smokers have a significantly higher risk of developing malignant lymphoma. Studies indicate that cats with any household ETS exposure are more than twice as likely to develop this cancer compared to those in smoke-free homes, with the risk increasing with both duration and quantity of exposure. For instance, cats with five or more years of ETS exposure had a relative risk of 3.2 compared to those in nonsmoking households[2] I3l t4l t5l t6l. Oral Squamous Cell Carcinoma (SCC): Exposure to environmental tobacco smoke has been associated with a non-significant increase in the risk of oral SCC in cats. Cats with any exposure had 1.5 times the risk, and those exposed for more than 5 years or living with two or more smokers had 1.6 to 2.0 times the risk, respectively, though these findings were not always statistically significantt3lt4ltTl. Overexpression of p53, a tumor suppressor gene, was found to be 4.5 times more likely in tumors from ETS-exposed cats, suggesting a potential site for ca rcin ogen -related mutation[8]. Routes of exposure include inhalation and oral ingestion of particulate matter deposited on their fur during grooming[2][3] [4].Respiratory lssues Secondhand smoke acts as an irritant to the respiratory system and can exacerbate or contribute to chronic bronchial disease, feline asthma, and chronic bronchitis[9]. Biomarkers of Exposure Biochemical evidence confirms that cats in smoking households are exposed to ETS and uptake tobacco- specific carcinogens. They have significantly higherconcentrations of total nicotine, total cotinine, and 4- (methylnitrosamino)-1_ (3_pyridyl) -1-butanol (NNAL) in their urine compared to cats f rom non-smokinghouseholds[10]. Hair nicotine concentration in cats is also strongly associatld withowner-reported ETS exposure and can serve as a biomarker[11]. Effects on Dogs Dogs are also susceptibre to the negative hearth impacts of secondhand smoke,including an increased risk of certain cancers, respiratory diseases, and behavioralchanges. Cancer Nasal Cancer: Long-nosed (dolichocephalic) dogs living in households with smokers have an increased risk of nasal cancer, with odds ratios up to 2.5 for the highest exposure levels. Conversely, short- and medium-length-nosed dogs did not show this association [3][12]. Lung Cancer: While secondhand smoke is associated with primary lung cancer in humans, a definitive association has not been consistently found in dogs, though study limitations may exist [13]. DNA Damage: Exposure to cigarette smoke causes DNA damage in the oropharyngeal tissue of dogs[13]. Respiratory lssues Exposure to secondhand smoke is a significant contrlbutor to chronic coughing and bronchitis in dogs[13]. Veterinarians often observe that dogs living with smokers will consistently cough, and remission of bronchitis is unlikely without removing the dog from the smoke-filled environment. Removal from the smoking environment can lead to the resolution of coughing symptoms[13]. While exposure to environmental tobacco smoke was not confirmed as a risk factor for chronic cough in one study, the association deserves additional study[14]. Behavioral Changes A study found significant associations between secondhand smoke exposure and alterations in six key behavioral traits in dogs. Exposed dogs demonstrated increased fearfulness, reduced activity levels, heightened aggression towards people and other animals, diminished trainability, and elevated anxiety, suggesting a higher rlsk for behavioral problems['15]. Biomarkers of Exposure Urinary cotinine levels are significantly higher in dogs exposed to household smoking, and the level increases linearly with the number of cigarettes smoked by household members[16]U71. Dog hair nicotine concentration is also strongly associated with reported ETS exposure, with median levels in regularly exposed dogs similar to those reported in children and women exposed to secondhand smoke, suggesting it can be a useful biomarker[18][19]. Marijuana Smoke While research directly linking marijuana smoke to chronic bronchial disease in cats is limited, it is understood that smoke from any source can irritate a pet,s respiratory system and exacerbate or perpetuate underlying lower airway disease such as asthma or chronic bronchitis. cats are particularly sensitive to airborne irritants due to their grooming habits, which can lead to the ingestion of particulate matter[9]. General Considerations and Recommendations Socioeconomic Factors: Dogs and cats from lower socioeconomic settings have a higher rate of exposure to ETS[20]. owner Education: Educational campaigns informing pet owners of the risks of sHSexposure for pets can motivate some owners to quit smoking or make their homessmoke-free. Many owners are more wilring to change their behavior for their pets, health than for their own[3][13][21]. Advising owners to smoke outside, away from pets, and avoiding smoking in enclosed spaces can help reduce exposure[3][9] t131. Prognosis: Early detection and prompt treatment are associated with a good prognosis for smoke inhalation injuries in general[1]. However, for chronic exposure to secondhand smoke, reducing or eliminating the exposure is crucial for improving the pet's health and prognosis. ReferencesClick + to expand Al Helper lf I didn't find what you were looking for, don't give up; talk to me.