Early in my vaping career, I had problems with severe nausea and dizziness on 12 mg. My doctor told me that in view of the fact that I have a progressive hearing loss, I should probably go to 0 mg nic. I panicked, and immediately went to 0mg, not realizing that I was drinking lots of tonic water-- which can also cause problems. Recently I got bored with vaping, and went to 3mg.