I had the exact same thing happen, like everyone says keep hydrated I drank TONS of water, didn't really help much, used cough drops. It hurt so much that I started smoking analogs in hope that it would help, it didn't really did ease it just a hair.
Anyway the next day it was much better still there tho and by the third day it was fine. Oddly enough 5 days after I had smoked those few analogs, my throat started hurting not nearly as much but again. Kept hydrated, used cough drops again, but didn't smoke analogs this time, and I have not had that issue since.
I've convinced a number of friends to give e-cigs a shot, and every single one of them experienced this soar throat... Only one gave up on it because it hurt too much.
I'm guessing that since none of my friends nor I, went to 0 nic juice, I believe (completely unfounded by research or medical knowlege) that it is the tar and other chemicals that have been expelled from our systems that causes this issue.
Now that I've been vaping only for a few months and haven't had an analog, I've also noticed that first thing in the morning I don't NEED a drink ASAP. I still get up make my pot of coffee goto my office and start working. But normally I'm watching the clock it takes 3m for my coffee pot to brew a full pot and I'm heading there to grab a cup of coffee. Lately I still grab a cup but there have been times I've been working and forgot for HOURS.
The very first time that happened I shruged it off as a fluke, but it's happened more than once now and like I said earlier I've noticed that I'm not having to drink something immediately. Currious if others have had this too?