The area would be called the TRACHEA. Try hitting your pv differently. I do a direct inhale (unlike I did cigarettes)......but I know that alot of people can't do this.
Also, try a different
juice, the flavor you are using may not agree with you.
Also, something to consider is PG sensitivity...........try a
juice with a higher VG content, they seem to be a bit smoother.
Stay hydrated & stay on ECF! Lots of helpful information here. Let me know if there is anything I can do to help ya out.
vape happy!
Jen