Well for one tobacco is made from plants which themselves are made of all sorts of organic compounds. Then you burn it which turns those compounds into even more compounds, so there’s just a lot of stuff you are breathing in.
Vapes heat a manmade mix of glycol, nicotine, and flavoring. Less variety, and more control of the makeup potentially makes them less unhealthy unless you put a carcinogen in it. And since there’s no burning you don’t get as many unpredictable byproducts.
Granted we haven’t been inhaling vaporized glycol en mass for decades, so it’s not like there’s hard data on if they are less bad. Though it does seem likely, there’s a chance it could actually be rather bad in the long term. Also some vape fluid guys like to put all sorts of stuff in their mixes.
Anyway you don’t actually need electricity. Vaping was done well before pocket vapes by heating stuff up with a flame in a glass container. But electrical heating is much more easily controllable than an flame.
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