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http://www.examiner.com/article/is-secondhand-smoke-from-e-cigarettes-harmless
The researchers found that e-cigarettes are a source of secondhand exposure to nicotine but not to combustion toxicants. The air concentrations of nicotine emitted by the three brands of e-cigarettes ranged from 0.82 to 6.23 µg/m3. However, the average concentration of nicotine resulting from smoking tobacco cigarettes was 10 times higher than from e-cigarettes