My first setup was an eGo 650 mah with the type a atomizers. At the time I had no idea even how to vape other than what I would see in the youtube videos and the information in this forum. So, I would try to vape all of the liquid in the little tank to save money and eliquid. After a couple of days of using the little atomizers that came with it the draw kept getting harder and harder, so I would draw in harder. Plus the juice was 50/50 pg/vg. After two weeks of doing this my throat felt like it was on fire and hurt like blazes.
So after reading this forum for hours, I came across cartomizers. Remember I had no idea of how to vape at all. So I called the vendor I got my setup from and asked a few questions. It was like pulling teeth. I explained that I was so new I squeaked but yet she wasn't giving me any ideas. So I mentioned that I didn't want to constantly be fiddling around refilling the little tanks and I wanted a warmer vape and would like to order some cartomizers.
As soon as I got them, I filled one up, and the rest is history. From single cartomizers I graduated to dual coil tanks to clearomizers, and on and on. So my answer to you is that vaping should not irritate your throat to the point of pain. Look in this health forum and others to get the answers to your questions:
Health and Medical Issues
Thankfully I've found very helpful and friendly vendors and they've gone out of their way to answer my questions and make suggestions. Of course, I'm mature enough to know that if the product I buy doesn't work out it is ultimately my decision to buy it and not the vendor's fault.
I've spent hours upon hours reading through the information here, and the only advice I can give you is to read for yourself. Good luck, hope your symptoms go away, you find the cause of your distress, and vape on!