An atomizer includes a storage member and a cigarette holder. An inductive chamber and an airflow passage are positioned in the storage member. An air suction port is defined on the cigarette holder. The cigarette holder is movably sleeved on an end of the storage member. The cigarette holder can be in a locked state or in an unlocked state with respect to the storage member by moving the cigarette holder. When the cigarette holder is in the locked state, at least one of the inductive chamber and the airflow passage is closed by the cigarette holder. When the cigarette holder is in the unlocked state, the air suction port communicates with both the inductive chamber and the airflow passage.