In Europe we have the TPD (Tobacco Products Directive) this regulates us as a sector. After May 2016 the industry had to abide by the following laws.
Maximum Nicotine containing E-Liquid Bottle size is 10ml
Maximum Nicotine strength is 20mg or 2%
Maximum Tank size is 2ml
All Nicotine containing liquids must be tested by the MHRA
All products must be registered with the MHRA