Was actually thinking about starting a thread regarding something i've been experiencing very similar to what you are. However, i am a chain vaper @ 18mgs. I go through about 4ml or more a day (estimate).
Last night and also today, i've noticed that my lungs hurt and i'm breathing heavier. I'm starting to get concerned because i have heart issues and if
vaping is causing this, then i do NOT like it!
Maybe this will pass, but it's odd that i've been
vaping a month now and it's "just now" starting to bother me? My advice for you would be don't give up and go back to the analogs just yet and if it continues, check with your dr. That's what i plan on doing!
EDIT: oh wait, just read where you're not an ex-smoker....wellllll, i'm not sure what to tell you! ha