Abstract: An exemplary electronic cigarette includes a housing, a mouthpiece arranged at a first end of the housing, a simulate cigarette end arranged at an opposite second end of the housing, a battery module received in the housing, a liquid cup arranged in the housing, and an atomizing unit arranged in the housing. The liquid cup is configured for containing tobacco liquid. The atomizing unit is electrically connected with the battery module, and configured for atomizing the tobacco liquid to form aerosol. The liquid cup includes a cup body and a resilient plug at an end of the cup body. The resilient plug is capable of being pierced by a needle of an injector, and capable of restoring to a sealed state after the needle of the injector is removed.