A mom says her 17 year old had no problem buying vapes from an area shop and has the credit card charges to prove it. After she and her son agreed to speak with us, we launched our own investigation. how old do you have to be to vape Definitive Guide Teen vaping rates remain high in Missouri despite health risks History of tobacco minimum purchase age by U.S. jurisdiction Wikipedia MO schools have a new way of combatting vaping among students