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Although manufacturers claim that the flavoring ingredients are 'food grade' and are labeled GRAS (generally recognized as safe), these claims are only applicable for additives designed for food or ingestion and not for breathing or inhalation

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Neurological effects in the offspring after switching from tobacco cigarettes to e-cigarettes during pregnancy in a mouse model

Nicotine may initially improve alertness, but its effects are shorter-lived compared to caffeine

That let them stay on the market while being reviewed by the FDA