FDA warns KY vape shops of illegal brands being sold, teenagers at risk How old do you have to be to vape? Kentucky smoke shops must obtain new licenses as new law takes effect The UK will ban disposable vapes and curb candy flavored e cigarettes that attract children under 18 The Hill Only FDA authorized vape products are available for purchase in Kentucky. Here's what to know January 1st marks deadline for Kentucky vape, tobacco retailers to apply for licenses