However, this deterrent effect - if present - depends upon the availability of flavored electronic cigaretttes. If only tobacco and menthol e-cigarettes were to be allowed on the market, this deterrent effect could no longer take place.

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."

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