I have seen some VERY interesting posts in this thread, as i am new to the site also, (just made my account a little while ago) and have only been vaping for a very short time now, i have been an avid hookah aficionado for years (i have 6 hookah and have tried so many different coals, flavors, and setups), have smoked off and on for years (Marlboro Reds) and even done dip/snus pouches in the odd meantimes.
Bottomline, i did some research and finally just bit the bullet (the initial cost) and started vaping. i had had a major sinus infection crop up several months ago from a house i moved into that had a very bad mold problem (had to get a lawyer to break my lease so we could move out) seen a doctor and she told me without a doubt the mold was the cause, we went over my tobacco use, and pros and cons to anti biotics and what course of action would help to clear it up the soonest, keeping in mind i was not yet vaping at this time.
She essentially told me the antibiotic would help but not fix the issue. with my tobacco use the issue would be helped with a prescribed med, but only slightly, i was told to just ride it out or stop using tobacco until it went away so my immune sysem could pick up and clear it out. well ive been dealing with it for around 3 months now using snus pouches regularly and its only been slowly getting better.
As i said i just recently tossed the snus for a vape kit (picked up a spinner 1300, a aspire ce5 tank, and a kanger EVOD tank, got a small bottle of nicquid Blueberry tart 6mg nic, and a big bottle of Space jam Pluto 6mg) my initial cost total with case and charger was under 100 bucks and i have enough supply to last me around 3 months although i know ill be back in to get more flavors and tanks haha.
All that said and done, i can already tell my sinus infection has started to clear and i do believe it is solely due to the fact i dropped the 2-4000 different chemicals in the tobacco products i was using.
so this post is coming from somebody who had the OP's issue before I started vaping, and can say i have seen nothing but positive effects over regular tobacco usage. try different liquids from KNOWN trusted brands, Jamesons, Space Jam, Or perfected Vapes just to name a few, and use a low setting if you have a VV or VW to start off and set it up properly, improper setup can burn coils, burn seals and even melt some other parts which are not meant to be inhaled to begin with.
Just my two cents.