Here is a longer term study backing up the claims of vaping being much healthier than smoking.
Long-term study shows that vaping really is safer than regular smoking
(just in case the link is removed look up digitaltrends & e-cigs-safer-regular-cigarettes)
Long-term study shows that vaping really is safer than regular smoking
(just in case the link is removed look up digitaltrends & e-cigs-safer-regular-cigarettes)