I have had this happen to me as well. In fact, I thought for months that I had some kind of illness - not related to vaping. I thought this because I was already using only 10 or 8 mg juice... BUT it's true, good delivery systems really make a difference. I was making myself sick all the time! lol.
My usual symptom was nausea. The worst ones .. double vision (hence dizzy), nausea, vomiting, and cold sweats. Good thing I finally figured it out. I now use mostly btwn 6 and 4 mg juice.
Ugh.. all those months I coulda avoided it!!