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1 2 Dermatology: 2-Volume Set

however, in the 1960s, chemists working at the tobacco company Philip Morris discovered that if tobacco is treated with an alkaline solution (e.g., ammonia-based), nicotine is converted to a much more volatile free base (more than 100 times), which greatly increases its absorption in the lungs and brain

This system heats tobacco without any direct contact between the electronics and the heating element

The article in its entirety, including a complete list of references, can be found here

I remember we did each of those interrogations at least four times

You may also see it sold as an eGo VV or Variable-Voltage eGo. This type of eGo e-cigarette battery includes regulation circuitry allowing it to operate at between 3.5 and 4.8 volts