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."

Third, e-cigarette users tend to decrease the strength of nicotine in their products, leading one to believe that overall levels of addiction to nicotine decline compared to their baseline smoking status.

Blu: nicotine, PG, VG, water, citric acid, flavorings

"It is not known how much nicotine or other potentially harmful chemicals are inhaled by users, nor is it known whether e-cigarette use may lead to use of other tobacco products. Neither are the benefits of using e-cigarettes over traditional products known."

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