An exemplary atomizer (10) includes a housing (30), a mouthpiece (12), a liquid chamber (16) arranged in the housing, and an atomizing component (18) arranged in the liquid chamber. The liquid chamber is configured for storing tobacco liquid, and defines an air passage. A first end of the air passage is connected with the mouthpiece. The atomizing component is configured for atomizing the tobacco liquid to form aerosol. The air passage allows the aerosol to pass through. A second end of the air passage is in communication with the atomizing component. The liquid chamber defines a liquid outlet (162) at a bottom part. The liquid outlet (162) is in communication with the atomizing component, so that the tobacco liquid in the liquid chamber can flow to the atomizing component via the liquid outlet.
