[Udik]

I don't get why it is so difficult to check this. At this point there is probably a good amount of people that has been exclusively vaping for the past 10 or 20 years, after decades of smoking. The statistics for lung cancer and other smoke-related illnesses 10 or 20 years after quitting smoking completely should be already well known. It should be enough to compare the two to understand the difference in harm between smoking and vaping?