I wanted to add to this because what I've seen to be the cleanest "vaping" is not liquefied or wax product, but actually lower heat directly on tobacco or pot. It requires more power but it essentially takes warm air and blasts it through the tobacco instead of burning it. The drawback was that these units required plug in power or used butane to heat the air.
I think there is an actual business opportunity to help with this problem if someone can create a product which uses up to date batteries. I have not seen these products anymore because it seems everyone has gone to the liquefied or wax pen sized pipes. If you use actual tobacco you're less likely to have "cheap" additives embedded into your vape.
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