Just comparing vapin' to cigs can't really be done because they're two different things. I've used that as a start to just about all of my 'vape discussions' with my friends, most of whom still smoke.It's not easy to compare vaping nic to cigarette nic.
I guesstimate a lot of things, vapin' included!..it's all just guessing...
I'm close enough to 50 years old that push mowin' 5 or 6 yards in a day tires me all out.. but when I finally get done I'm not winded, nor do I have to stop to catch my breath!..hiked 10 miles like I was 20 years old.