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http://www.ibtimes.com/e-cigarette-secondhand-smoke-study-finds-nicotine-few-toxins-1507608
Study can be seen here http://ntr.oxfordjournals.org/content/early/2013/12/10/ntr.ntt203.short?rss=1
They found that both e-cigarette vapor and regular cigarette smoke contained nicotine, but the average concentration in e-cigarette vapor was about 10 times lower, on average, than the amount found in the tobacco smoke. But the e-cigarette vapor did not contain some of the other toxic products found in cigarette smoke.
Study can be seen here http://ntr.oxfordjournals.org/content/early/2013/12/10/ntr.ntt203.short?rss=1
Results: The study showed that e-cigarettes are a source of secondhand exposure to nicotine but not to combustion toxicants. The air concentrations of nicotine emitted by various brands of e-cigarettes ranged from 0.82 to 6.23 µg/m3. The average concentration of nicotine resulting from smoking tobacco cigarettes was 10 times higher than from e-cigarettes (31.60±6.91 vs. 3.32±2.49 µg/m3, respectively; p = .0081).
Conclusions: Using an e-cigarette in indoor environments may involuntarily expose nonusers to nicotine but not to toxic tobacco-specific combustion products. More research is needed to evaluate health consequences of secondhand exposure to nicotine, especially among vulnerable populations, including children, pregnant women, and people with cardiovascular conditions.