e-cigarette
noun [ C ] uk/ˈiːˌsɪɡ.ər.et/ us/ˈiːˌsɪɡ.ə.ret/
电子烟
an electronic device that looks like a cigarette and allows someone to breathe in nicotine (= the drug found in tobacco) using vapour (= gas from heated water) rather than smoke, so there is no tar (= the harmful black substance produced when tobacco burns)
Compare: vaping