medicaldaily.com – 4 de Febrero de 2015 – EEUU
When electronic cigarettes hit the U.S. market back in 2007, not all health care practitioners were quick to label them a safer alternative to traditional cigarettes with nicotine. A recent study conducted at the Johns Hopkins Bloomberg School of Public Health has revealed that exposing mice to e-cigarette vapor results in a compromised immune system in the lungs as well as exposure to potentially dangerous chemicals found in traditional cigarettes.
"Our findings suggest that e-cigarettes are not neutral in terms of the effects on the lungs," Dr. Shyam Biswal, a professor in the Department of Environmental Health Sciences at the Bloomberg School, said in a statement. "We have observed that they increase the susceptibility to respiratory infections in the mouse models. This warrants further study in susceptible individuals, such as COPD patients who have switched from cigarettes to e-cigarettes or to new users of e-cigarettes who may have never used cigarettes."
Biswal and his colleagues placed one group of mice into an inhalation chamber where they were exposed to e-cigarette vapor equal to actual human e-cigarette inhalation over the course of two weeks. A second group of mice were placed in a different inhalation chamber where they were exposed to air. Following e-cigarette vapor or air exposure, each group of mice were divided into three subgroups. One subgroup received nasal drops with Streptococcus pneumonia, the second group received nasal drops with virus Influenza A, and the third group did not receive any virus or bacteria.
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