An ingredient that is considered safe in some foods to eat but not safe to inhale into the lungs is called Vaping.
Vaping products (electronic cigarettes or e-cigarettes) are devices that heat a liquid into an aerosol that is inhaled (breathed in) into the lungs. These devices are commonly called vapes, mods, e-hookahs, sub-ohms, tank systems and vape pens. They may all look a bit different, but work in similar ways.
With this information, we can conclude that Many of these substances are considered safe for ingestion (food); however, they are heated, they create new chemicals that may not be safe to inhale.
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