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Similarly, a compound called benzoic acid naturally found in cranberries adds to the fruit's sourness.

It was recalled due to an excessive amount of benzoic acid - a common preservative used in food and drinks.

So they did all kinds of just really organic research and ended up settling on benzoic acid as the organic acid that was the most satisfying.

In addition to nicotine, Juul pods contain a mix of glycerol, propylene glycol, benzoic acid and flavoring agents, the long-term health effects of which have yet to be determined, she said.

Blending benzoic acid, a common food preservative, into e-cigarette nicotine liquids provided another advantage: a more direct path to the lungs, in which the stimulant is then propelled to the brain through the bloodstream.