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Consequently, stricter regulation and a higher quality control in the e-liquid industry are required. The mislabelling of nicotine content in e-liquids has been previously addressed [8, 34]. Of note, several studies have detected nicotine in those e-liquids labelled as nicotine-free [5, 35, 36]. Among the 17 samples tested in this latter study 14 were identified to be counterfeit or suspected counterfeit. A third study detected nicotine in 7 of 10 nicotine-free refills, although the concentrations were lower than those identified in the previous analyses (0.1–15&nbsp