Update: Sorry, but I promise this is my last post about this. I finally figured out what caused the throat and chest pain I've been having late today and tonight. I used the 5 volt passthrough in my office for an hour or so each on Wed and Thurs and for about three hours today. That extra heat has gradually burned into spots in my throat and lungs. So I just need to slow down with vaping, quit using the passthroughs completely, and allow those burns to heal, because any time I vape tonight with the eGos and cartomizers, the vapor is irritating those burns and causing more pain. This is what I went through back in early October when I first got the passthroughs -- and is the reason why I quit using them, until a little bit this week.
So I'm sensitive to the heat produced by 5 volts, probably due to taking three blood thinners every day for the last six years, including Coumadin, Plavix, and Aspirin, not to mention Crestor, Toprol, and Prinivil.
The solution to ease the throat and chest pain was to drink 1/2 bottle of water.