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There’s no evidence of this. Everything I’ve read indicates that vaping is likely (and dramatically) less harmful. The levels of toxins are orders of magnitude lower or nonexistent in vapor.

Also, there’s no combustion when liquid-based nicotine solution is atomized.

I grant that vaporization occurs at a lower temperature than combustion, but it is still a chemical reaction that relies on a heating element. Proponents of e-cigs have always argued that this makes e-cigs safer, and it does not produce the same compounds that yobacco burning does. What is not clear is whether the compounds produced are safer.

Vaporization (boiling) is not a chemical reaction.

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