E-cigs involve direct contact with the heating element at a much higher temperature than food would normally be exposed to. A quick google shows that the elemen

E-cigs involve direct contact with the heating element at a much higher temperature than food would normally be exposed to. A quick google shows that the element can be as hot as 500F, and the fluid will be in direct contact. Also, the organics used in e-cig fluid are smaller and more easily ripped apart by heat. Imagine you want your house to smell like coffee. So you heat a baking tray until it is white hot. Then drip coffee onto the tray (don't actually try this). Much of the coffee will be vaporized with the water in it providing a nice aroma. But some of it will be in direct contact with the tray and will burn and have a nasty smell. The hotter the tray is, the more the coffee gets burned and transformed into not-coffee. E-cigs are like that, except one doesn't notice the nasty aroma of the accidental chemicals.