In summer 2019, hospitals across the US began reporting clusters of severe lung injury in people who vaped. By October, the CDC had named the condition EVALI (E-cigarette or Vaping Product Use-Associated Lung Injury). Panic spread quickly. Headlines declared "vaping causes fatal lung disease." Lawmakers rushed to ban flavored products.
What Actually Caused EVALI?
By late 2019, the CDC and FDA had identified the culprit: vitamin E acetate, a thickening agent used almost exclusively in illegal THC cartridges sold on the street. The evidence was overwhelming:
- Vitamin E acetate found in lung fluid samples from 99% of EVALI patients tested (CDC, February 2020)
- Outbreak concentrated in states with legal recreational cannabis but unregulated market
- Cases dropped sharply after enforcement targeted illicit THC cart suppliers
- No confirmed EVALI deaths linked to commercial nicotine-only products
In plain terms: EVALI was not a "vaping problem" — it was a street drug problem that happened to involve vaping devices. The products that caused EVALI were illegal THC cartridges cut with vitamin E acetate to stretch the oil. Regulated nicotine e-cigarettes do not use vitamin E acetate and were not associated with the outbreak.
Where EVALI Stands in 2026
EVALI cases have declined dramatically since the 2019-2020 peak. The CDC continues monitoring but has downgraded its emergency response. However, the outbreak permanently shaped public perception — many people still associate all vaping with deadly lung injury, even though the cause was specific to illicit products.
For a broader breakdown of ingredient safety — including vitamin E acetate and other additives — see our deep-dive on what's actually in your e-liquid.
