Actually the substrates are PG or (more popularly) VG. That’s propylene glycol or vegetable glycerin. The latter is obviously plant based and studies have even measured the concentration vapers breathe as meeting OSHA standards.
The real dangers of vaping are: the vasoconstriction of nicotine, the flavoring (which famously caused issues when a substance that was safe to consume but not inhale was used), and the free radicals from burning cotton or oxidizing metal in the coils.
Low quality coils can be very dangerous.
That is why open and free access to products consenting adults want to use is important.
Most quality vaping is done with ceramic coils.
There are facts and nuance and reason. Or reactionary emotive perspectives that only hurt everyone involved. The choice is yours.
It's like they want it both ways.
This is not a thing that's true, it's a thing you assume. Having different smokes or vapors in your lungs can have different effects, just as drinking different liquids can have different effects. Tobacco smoke causes cancers. The more elements in another smoke that are shared with tobacco (or other plants that cause disease) the more the new smoke should be suspect, and it suggests a direction for initial testing. We can't just treat all odors as cancer-causing; vaping doesn't even involve burning vegetable matter, so even if burning some chemicals common to all plants causes cancer, that wouldn't make vaping suspect.