E-cigs are often made in two parts, the battery, and the device called an atomizer or vaporizer. It's just a resistor wire that heats up enough to vaporize the liquid. The liquid is kept in contact with the wire using a wicking material. I don't know where the switch is on classical e-cigs, but it is usually activated by moving air through the device. Some are manual where you push a button on the battery.
The interesting part is the battery. It has a screw connection that the vaporizer part screws into. This would lend itself nicely as a power supply for several different diode lasers of low power, instead of having a separate host for each diode. But it's a very niche market, only people who use e-cigs AND like lasers would be interested. But yeah, I just like how its a standardized connector with a name, like 501 or 801 or something like that. Push the button and there is battery voltage at the terminals.
