Three potential reasons that could be causing dizziness that I can think of:
1/ You're taking a lot of puffs and breathing in a focused and/or more shallow manner. If I draw frequently on an analog or a PV, I get a little heady. Just taking some deep breaths in between can help.
2/ You're getting more nicotine than your body is used to in a short time span. If dizziness comes with a jittery feeling, that's probably it, and the nic level's too high for your frequency of
vaping.
3/ If you've been quitting analogs or recently did so, your blood pressure's probably dropping too. Even with
vaping, I find that reducing my analog intake has given me a tendency to head rushes. Your body just takes a little time to adjust to lower BP and the dizziness subsides.
And if it's none of these, well, hopefully it's the pleasant kind of dizzy and not the sick kind of dizzy.
