Because lighting carbon-based molecules on fire creates thousands of carcinogenic components that are difficult to enumerate. Vapor, on the other hand, (theore

Because lighting carbon-based molecules on fire creates thousands of carcinogenic components that are difficult to enumerate. Vapor, on the other hand, (theoretically) contains only 3 chemicals: glycerin, propylene glycol, <nicotine/THC/active stimulant>. In practice though, vapor has probably thousands of compounds as well due to "flavors", additives, and side effects of the heating coil on those things. It's all about perception though. Lighting something on fire and inhaling smoke is perceived as dangerous compared to inhaling "vapor" (which everyone does every day in the shower, right?)