There's plenty of research about what harm tobacco/smoking does that isn't going to be present in vaping* [1]. There is also intrinsically less evidence on the parts of vaping that are unique to it such as the solvents, the device materials, etc.
It's been a few years since I've really looked at the research in depth but as I recall (smoking) tobacco was just a crazy outlier on the scale of what causes cancer. Part of the issue was the amount people smoked what seems absurd now where even someone who seems like they smoke a lot really only smokes a few a day. And compare that to cannabis consumption and the amount of organic material burned/inhaled per day is just astounding when you look at heavy tobacco smokers.
Also, as far as I've heard, the US's campaign against and problem with teenage vaping is unique and its treated completely differently in Europe/UK.
It's been a few years since I've really looked at the research in depth but as I recall (smoking) tobacco was just a crazy outlier on the scale of what causes cancer. Part of the issue was the amount people smoked what seems absurd now where even someone who seems like they smoke a lot really only smokes a few a day. And compare that to cannabis consumption and the amount of organic material burned/inhaled per day is just astounding when you look at heavy tobacco smokers.
Also, as far as I've heard, the US's campaign against and problem with teenage vaping is unique and its treated completely differently in Europe/UK.
[1]. http://ecigarette-research.org/research/index.php