Can you vape with just the flavoring?

Theoretically it's possible, but it must never be used directly. Just like you wouldn't drink the vanilla extract used for baking directly - the reason is simple: it wasn't designed to be inhaled directly.
?? What would happen if you "use directly"?
It's extremely irritating and may damage the respiratory tract: High concentrations of fragrance molecules will directly stimulate your mouth, throat and lungs, causing severe coughing and breathing discomfort. Some chemical substances even have corrosive properties at extremely high concentrations.
The taste is unbearable: Besides the irritation, the strong concentration of the fragrance will make the flavor extremely bitter and astringent, making it impossible to swallow at all.
☣️ "Using directly" is dangerous for what reason?
The core issue lies in the fact that many flavoring components allowed to be added to food have unknown inhalation safety. Direct inhalation of undiluted high-concentration flavoring can bring a series of health risks:
Risk of lung damage: Some fragrance chemicals (such as diacetyl) may be associated with serious respiratory diseases, even in zero-nicotine products.
Cellular-level harm: Studies have shown that even without relying on nicotine, certain fragrance components may trigger systemic inflammation and put pressure on DNA. Although the impact of the fragrance mixture itself needs to be evaluated, the risks still exist.
??‍🔬 The correct approach: Dilute! Dilute! Dilute again!
Remember this: The small bottle of strong-smelling liquid in your hand is a high-concentration fragrance essence, used as a "raw material" for blending. The correct procedure is to first dilute it with PG (propylene glycol) and VG (vegetable glycerin) base liquids in a specific ratio.
The content of the flavoring agent in the final product usually ranges from 5% to 20%.
Novices can purchase a bottle of "diluted base solution" that comes with the fragrance. According to the product instructions, simply mix the two together evenly.
Safety is always the top priority, so never consume any concentrated fragrance directly.