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@rak500
3.3v is rather low.
4v to 4.2v is normal battery level for almost any charged e-Cigs. The article does mention 5v as a problematic voltage, and it was already known that high temperatures do create formaldehyde and acrolein which are very carcinogenic. But this problem only occurs when the voltage is far too high, like 5v, or when the resistance or the ecig are faulty, but it really tastes awful so if it doesn't taste "caramelized" or burnt, you should be fine.