http://www.ecita.org.uk/docs/ECITA_Press_Release.pdf

Basic mathematical errors by officials across the EU have resulted in e-cigarette liquid being wrongly
categorised as a highly dangerous substance like strychnine and formaldehyde when most e-liquid is in a lower hazard category than washing-up liquid.
A report by the toxicology consultancy bibra concluded that the concentrations of nicotine in the vast
majority of e-liquid (which is below 25mg/ml or 2.5%) do not require any type of hazard warning for acute oral and dermal toxicity.