I'll maybe start down here. You're pretty crazy man

in a good way though. Seems that vaping for you borders a spiritual experience. I'm nowhere near as passionate about vaping myself, for me it was initially a tool to get me off the cigarettes, but somehow now the whole concept evolved and is turning into a hobby. I have other hobbies though to which I sacrifice more time, so I need to balance it out.
For example, I've decided that I will not be building my own coils. The time and resources needed to perfect this skill: I would rather use for other things I'm keen on. Like, for example, aquascaping, crafting my own fishing lures and making fishing riggs etc. I will stick to buying pre-made coils as there is a good selection out there made by pros. Maybe in the future I'll change my mind and get passionate about it, who knows.
"Sensing harm" being at the core of the human species: I have to disagree. It may apply to simple stuff, but when it comes to vaping, it's impossible for the human body and brain to detect dangers. The vape you inhale is complex, especially the multi-flavored juices, there is little knowledge about how exactly it affects the human body, and at the same time it often tastes divine, yet there might be harmful compounds within it. Human brain and body are easy to cheat.
A good example of that is simply the modern food: a piece of quality meat is nearly impossible to distinguish from a piece of same quality small meat pieces glued together into one piece with meat glue. Sweet, artificial, delicious, and widely available food: people find themselves very attracted to it, and it's implications, like obesity, combined with related diseases, are moder-era plague. Somehow a great proportion of human race fails to detect that what is essentially tasty, appealing, and looks great and 100% palatable, is a slow and silent killer.
Because of the technology and modern lifestyle, we've drifted far away from the environment in which the natural instincts and defensive mechanisms you describe could thrive, and the only weapon we have is to learn what is good and what is bad for us. There just wasn't enough time for humans to develop new mechanisms that would allow us to use our senses again to keep us away from modern dangers.
In case of all the things unknown or not enough learning sources available, you can only attempt to use common sense, and this is what I meant when I used the expression "going by the gut".