VOA慢速英语:美国卫生官员敦促人们停止使用电子烟

substitute - n. a person or a thing that takes the place of someone or something else

inhale - v. to breathe in

flavoring - n. a substance that is added to food or drink to give it a desired taste

vape pen - n. a device -- similar to an e-cigarette -- used to vaporize substances for inhalation

epidemic - n. an occurrence in which a disease spreads very quickly and affects a large number of people

unilaterally - adj. involving only one (person, group or country)

statute - n. a written law that is formally created by a government