I had the same problem.. I also started with an Evod. But you can't run high vg in it, so I got a Subox, still had the sore throat until I lowered the nic level to 3. With me, I think it was the nic level that was making me cough and have throat congestion I thought 3 mg nic wouldn't be enough for me.. Smoked 2 PAD for years. 3mg nic was just right. No more cough and no sore throat.It still did take some time even with that set-up for the sore throat and cough to go away. It's like others have said. When you first quit the stinkies, you have lots of bad stuff stuck in there that need to be hacked up. Drink lots of water, too. It really helps. I miss my Evod but the flavor and vapor is a lot better with the Subox. Congrats on dumping the ciggies!