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Because you are inhaling foreign chemicals into your lung in higher then normal dosages.

We do that all the time. Ever worked in a newly constructed building? Wondering what that smell is? Plasticizers, monomers, adhesive solvents, etc.

Same with a new car. Or cooking over the stove, bbq'ing. Or walking down a busy street with cars on it.

Just because you are inhaling "foreign chemicals" doesn't mean there are significant risk associated with it.

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It doesn't mean they are safe either. The difference between these situations and vaping are, vaping you are doing intentionally and habitually.

I agree, but people who vape are (generally) moving from something that has a lot of known risk. Moving from smoking tobacco to vaping is likely orders of magnitude lower risk, just from the fact combustion isn't happening.

I agree that we should get more information about the risk of vaping, but the wholesale banning of vaping is likely to be more harmful than just leaving things as is.[1]

[1]Not saying you are arguing for banning vaping, but FDA did take that position originally until they got smacked down

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