In fact, this is precisely what Trueba et al. demonstrated in a of changes in exhaled nitric oxide levels in 41 healthy college students.

•People shown using e-cigarettes or playing a significant role must neither be, nor seem to be, under 25

The main study finding was as follows: "The assessment of lung function demonstrated that neither a brief session of active e-cigarette smoking nor a 1 hour passive e-cigarette smoking session significantly interfered with normal lung function. On the other hand, acute active and passive tobacco cigarette smoking undermined lung function, as repeatedly shown in previous studies."

The authors write: "Consistent with the only other longitudinal population-level study with 1-year follow-up that we are aware of, we found that e-cigarette use by smokers was not followed by greater rates of quitting or by reduction in cigarette consumption 1 year later."

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