If I were going to use a pass through, the last place I would hook it up to would be my computer/monitor/printer or whatever since they all generally cost a ton more than any e cig.
I have had atty's short and more than my fair share of ego style ecigs have a total meltdown. While the idea of being chained to tetherer is not my personal choice, there are some of you who can handle that. My preferencece is to not be tethereded and use USB headsets for skyping and speech to text dictation with Dragon. With a cable, I was constantly damaging stuff.
If I were going to use a pass-through, I would get a 5 v USB to 110 power supply and not put my PC at risk. These are small, very common, and inexpensive (~$10). You can even get big battery external power supplies (like those used for cell phones)and with a pass through have a cheap, multi-functional, big battery mod. There was (is) even a mod that is based on such a device.