There is no question about health improvements happening after stopping real cigarettes . I have strong reservations about the choices people make when choosing their juice.
I am not one of those who believes all e cig juices have much lower levels of diketones in them than real cigarettes.
The famous "Five Pawns" juices showed to have levels that exceeded those of real cigarettes & with thousands of e juice company's out there i am not gullible enough to believe they are the only one.
Any respiratory issues that may be shown to be an issue in the distant future will never be called "Popcorn lung" it will be related more to COPD and other respiratory diseases .
Many medical professionals believe it's the diketones in cigarettes that are a big contributing factor for respiratory issues.
With people consuming MUCH more juice than ever before with sub ohm and high wattage it's a concern .
If i was in my 20's and 30's i wouldn't care but at my age and living dangerously when younger i am paying for some of those decisions now with health issues.
I vape diketone free juices as much as i can to eliminate as much possible risk as possible
To each their own though
I do think it's the tar that contribute to respiratory issues in a big way.
I don't smoke and don't worry about all the carp that they discover or think they do in vaping. Nothing can come close to the damage I did smoking a pack a day for 35 years. I think the biggest problem is that some use 5 volts or 15 watts, and some need 100-400 watts for Gawd knows what. And to utilize all of the 100-400 watts, some need to drop the resistance to less that 1. I think that's a great method for releasing bad toxic chemicals, which are not the intention of vaping for a healthier life.