PapaBloog
I have been on BP meds for nearly 4 years.  While visiting the opticians office, for some reason they checked my BP and it was whooo.....sky high.  Over 200 systolic.  Well, they all panicked and insisted, nay, demanded that I go to the ER immediately.
After 3 hours or so, the ER released me and I was referred to a Scott & White physician since I didn't have a regular doc.
He prescribed two meds and my BP went to around 145 in the mornings and 135 or so in the afternoon.  I had my last cigarette over 5 months ago, but that didn't seem to change anything.  Still running around 145 and 135.
So, I can't say for sure if switching to 
vaping will improve your BP readings.  
I do know that the "White coat syndrome" is not a myth.  Two weeks ago I went in for the annual check up.  I measured my BP before leaving home at 148/85.  I wanted to check my monitor against the doc's so I took it with me.  While he was present, I used my monitor and it went up to 183/104. 
Since I had given him a print out of my daily readings from home for the previous 30 days, He said, "Well, you've just got White Coat Syndrome.  For some reason I'm freakin you out."  I think it kinda hurt his feelings, LOL. 
Anyway, when I left his office I checked my BP in the car and it was down to 146/84.  Normal for me.