Nonsmokers have higher-than-average levels of residue, study finds
THURSDAY, April 9 (HealthDay News) -- More than half of New York City residents who do not smoke have elevated levels of the residue of secondhand smoke in their blood, says the city's health department.
And that suggests that nonsmokers in the city -- a number the city estimates at 2.5 million people -- are not adequately protected from cigarette smoke, it says.
"This is not what we expected," Dr. Thomas R. Frieden, the city health commissioner and a co-author of the study, told the New York Times. "It is a shocking number."
A study of 2,000 people by the city's Department of Health and Mental Hygiene, published online this week in the journal Nicotine & Tobacco Research, found that 57 percent of nonsmoking adults in New York City had elevated levels of cotinine in their blood, compared with 45 percent of nonsmokers nationwide. Cotinine, a byproduct of nicotine breakdown, is not harmful but signals exposure to tobacco smoke.
Among nonsmoking New Yorkers, 69 percent of Asian adults are thought to have elevated cotinine levels, putting them at the top of the list, according to the study. Lower-income adults were more likely to be exposed to secondhand smoke than those with higher incomes -- 63 percent vs. 54 percent, the study found.
Data for the study came from a citywide Health and Nutrition Examination Survey conducted in 2004, one year after the city's smoke-free air law took effect. The law aims to protect nonsmokers from secondhand smoke at work and in some public places.
"The study provides more evidence of the pervasiveness of secondhand smoke," Jennifer Ellis, a former health department epidemiologist and the study's lead author, said in a news release from the city. "It's not clear why New Yorkers experience more exposure, despite the city's relatively low smoking rate. It may be that living
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