The bottom line: it appears that the use of electronic cigarettes has tremendous health benefits not only for those who quit smoking, but also for those who become dual users. While it may take longer for these individuals to eventually get off of nicotine altogether, it appears that the switch to e-cigarettes yields a much lower level of nicotine addiction, making it easier, not harder, to subsequently cease using nicotine if they so desire.

Clive's letter begins as follows:

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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