If the voltage of the battery is inconsistent, the heating element fires at a cold temp and then increases to a hot temperature and the vapor will also be inconsistent. Not usually a problem, unless your e-liquid only tastes good at one temperature.

This is worth repeating: the nation's federal regulatory agency with jurisdiction over cigarettes is not sure that smoking - which kills more than 400,000 Americans each year - is any more dangerous than vaping, which involves no tobacco and no combustion and has not been shown to cause any harm. The FDA is not convinced that inhaling nicotine plus tens of thousands of chemicals and more than 60 known human carcinogens is any worse than inhaling nicotine plus propylene glycol and low levels of a few other chemicals.

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