Yes. Could be your nicotine level's a bit high, or you're a smidge sensitive to PG, you're using an atomizer that's a bit hot, or you didn't hydrate enough...it's a balancing act and, as Mudflap said, the first few months you body's busy purging residual toxins from tobacco and healing damage. Makes it hard to nail down cause & effect.
For today, I'd say just drink more water than yesterday and see how that goes.
Melissa