If your worry is solely your BP, then I would take regular BP readings, write them down include time of day. Did you take regular readings during smoking? I mean did you take morning reading, after-a-cig reading, before a cig reading? THEN you would have something to compare it to.
You need to know what your BP "is" generally at certain times a day, after taking BP meds, before etc., **before** you can "know" if vaping will affect your BP. This "method" will be much more accurate for *you* than finding out how much nic in a cigarette, how much nic in a ml of your juice, how much juice you go thru etc.
Hope that helps.
I haven't had methodical readings before and after an ecig etc etc, but my BP is on the higher side with ciggis and eciggis too.