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The safest approach for others is avoiding indoor smoke exposure altogether

Moreover, 2005 data from a separate source, the Centers for Disease Control and Preventions Youth Behavior Risk Surveillance System (YRBSS), show a slight rise in the prevalence of use among high school youth (combining grades 9 through 12) between 2003 and 2005, from 21.9 to 23 percent (CDC 2006a)

Through its ability to conduct research at scale, it is able to engage in bold and long-term exploratory projects that are designed to influence and empower medical science globally

As doctors, we need to be really pointing out what the risks are, he said

(exogenous exposure)