There are no requirements that manufacturers test their e-liquids, nor are there any standards to meet. What testing is done is driven largely by the desire of e-liquid makers to market the safety of their products.
But the Journal Sentinel's testing led to yet another discovery: The method typically used to analyze e-liquids for the industry is not sensitive enough to detect levels that could be harmful. As a result, e-liquid makers across the country claim their formulas are diacetyl free when sometimes they are not.
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