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"Electronic cigarettes in Italy: a tool for harm reduction or a gateway to smoking tobacco?" Tobacco control 29.2 (2020): 148152

In some devices it is possible for e-liquids to come into direct contact with the heating coils in a process known as dripping, which may introduce metals and other constituents into the aerosol that users inhale

(en) San Francisco 2014 Litter Study [PDF], sur The San Francisco Examiner , Internet Archive)

Liquids, gels, aerosols, and alcoholic beverages Liquids such as alcoholic beverages with more than 24% alcohol but not exceeding 70% alcohol are limited to 5 liters (1.32 gal) per passenger in checked bags

Commission Implementing Decision (EU) 2015/2183 of 24 November 2015 establishing a common format for the notification of electronic cigarettes and refill containers