TPD stands for Tobacco Products Directive. This is the current set of regulations that E Cigs are governed by in the UK and throughout the EU. Although E Cigs and E Liquids are not tobacco products, the directive was amended and updated in May of 2016 to include them so as to promote better science and understanding of the effects of Vaping on the long-term health of users. It also ensures certain minimum safety standards are met in terms of quality control and ingredients.