What nicquids are you using? I know a fair number of people who are sensitive to PG and did much MUCH better on higher ratios of VG.
I also have known a good # of people who were getting a lot more nicotine out of their vapes than they expected and needed to cutback a bit.
My first inclination would be to try alternative juices with less PG and slot down the nicotine concentration.
There is also something I experienced myself that I should mention - a few of my early days starter kits came with cartomizers that were shipped in a rancid smelling foam sleeve. Whatever chemical that foam sleeve gave off certainly embedded itself in my
vape.
Tell us a bit more about your nicquid choices, your rig, etc. and maybe more people can chime in with thoughts for your consideration. Cheers, -Mags