These are common for people who have metabolic conditions or those that take certain seizure medications

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This internationally recognised standard for tobacco taxation has been developed and published for all countries by the World Bank (Jha & Chaloupka, 1999), World Health Organisation (WHO, 2010, 2014, 2015, 2017, 2019, 2021) and United Nations Development Programme (UNDP and WHO, 2019)
What must always be there is a small piece of paper written on transparent tissue paper showing the correct method of preservation