According to a "" on the Americans for Nonsmokers Rights (ANR) web site, short-term use of electronic cigarettes impairs lung function and can cause difficulty breathing:

The relative safety of e-cigarettes over tobacco cigarettes is their primary selling point.

"“E-cigarettes have the same physiological effects on the brain and may pose the same risk of addiction to other drugs as regular cigarettes, especially in adolescence during a critical period of brain development. ... Nicotine clearly acts as a gateway drug on the brain, and this effect is likely to occur whether the exposure comes from smoking cigarettes, passive tobacco smoke, or e-cigarettes.” ... “The effects we saw in adult mice are probably even stronger in adolescent animals,” said Dr. Eric Kandel. “E-cigarettes may be a gateway to both combustible cigarettes and illicit drugs.”"

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