I know thats what you and everyone out there 'wants' but you're failure to understand the most simple point is that vaping in and of itself is insanely variable. Everyone vapes differently so you will never get a sample size that can be accurately compared to your liking. IT WILL NEVER HAPPEN. They were able to link smoking cigarettes to disease rather easily because it's a single variable. The standard model for studying smoking is 'Pack years' across the board this gives medicine an reliable data point. "how many packs per day for how many years". How do you expect scientist to study something like vaping where everyone vapes different mg, different devices,coils,wire gauge, etc?
I beg to differ, there are many variables in smoking. Filtered, non filtered, full flavored, lights, ultra lights, some 20 per pack, some 25, deep inhalation vs mouth, etc, etc, etc.
Trust me, I certainly don't fail to grasp the concept of variability, but that's true of everything, not just vaping.