While I can’t speak to this specific paper, I know that the methodologies of several of these kind of “studies” are horribly flawed. I know there was one that found that heavy metals were released by coils … when the wattage was cranked up so high that no person would ever even be able to use the product that way. For non-vapers, if the wattage is too high, the cotton wick burns as well, and is impossible to inhale. The simple fact is that if the cotton wick isn’t burning, there’s no way the coil is getting hot enough to produce free metal vapors.

Remember when there was that rash of deaths? And nicotine vapes got the blame right away? Yeah, that was because some bathtub lab THC vape carts had vitamin E acetate in them. Remember when there was a lot of talk about popcorn lung? That was because of diacetyl, which is a butter flavor. Nobody has used it for a very long time.

I’m not trying to say that vaping is healthier than not vaping, but it is definitely safer than smoking tobacco. As a harm reduction method, it is a valuable tool.