Addicts believe any bullshit to justify the addiction, the brain is reprogrammed for that.
https://keck.usc.edu/news/dna-damage-levels-similar-in-vapers-and-smokers-study-finds/
Regardless of intake studies, vapers and smokers have the same level of DNA damage and it takes decades for this to play out with cancer rates, but the obvious truth that huffing any chemical is dangerous is only a matter of time.