A core cartridge for electronic cigarette includes a main housing, an atomizer, an actuator, and a leakage prevention arrangement. The main housing has a mouth piece portion, an atomizer portion, a connecting portion extended between the mouth piece portion and the atomizer portion, a liquid storage compartment formed in the connecting portion, and an air inlet. The main housing further has a vapor releasing channel extended from the atomizer portion to the connecting portion. The leakage prevention arrangement includes at least one drainage port formed in the main housing. The drainage port communicates the vapor releasing channel with the atomizer in such a manner that condensate formed on an inner surface of an outer boundary wall of the main housing is arranged to be guided to flow back to the atomizer through the drainage port.