Ok, here's a couple few more

to
throw on that pile.
I was in as much "smoker's denial" as anyone else. The coughing really wasn't that bad... when I wasn't coughing. The rattles in my lungs weren't really there - after I cleared and coughed a half dozen times I could make them go away when I went to bed... Since I wasn't having a heart attack I would never have a heart attack... Stuff like that.
The biggest reality check for me when I transitioned from smoking to
vaping was being forced into awareness of that rapid punch in my heart rate when I lit up a cigarette. Actually
feeling my heart racing and pounding while I was smoking a cigarette. What did I say about being in smoker's denial? Now I had these long spans of time when I was vaping and none of that happened. But within seconds of lighting up those few cigarettes each day... I couldn't ignore the impact smoking was having on my cardio vascular system any longer. BIG, obvious difference between those vaping apples and smoking oranges.
Sure, nicotine is a vasoconstrictor. But this isn't just about the nicotine. Combine nicotine with everything else you get from smoking - including carbon monoxide - and the total has a much larger impact on your system than just the nicotine alone. As it is, my MD thinks this whole vaping experience has far more to do with placebo effect than any significant amount of nicotine being had from the experience. I have asked him to check my blood levels for nicotine absorption and he won't. Thinks it's not medically relevant.
The only time I think you are at risk of cardiac arrest - and that joker did specifically state cardiac arrest - from e-cig liquids would be... if you are drinking it instead of vaping it.