A study conducted by scientists at the University of California Riverside revealed that vanillin, a common flavoring agent in e-cigarettes, caused changes in human embryonic stem cells during laboratory tests. Published on August 12, 2026, in the journal Human Reproduction, the research indicated that low concentrations of vanillin diminished the cells' capacity to differentiate into various types, whereas higher concentrations led to increased cell mortality. Inhibiting the TRPV4 channel mitigated many of the effects observed. The researchers warn that these conclusions are based on lab-cultivated cells and do not confirm similar outcomes in pregnant individuals. Additional research will explore the effects of other vaping substances.
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