An atomizer includes a housing assembly, an atomizing core, a lid, a liquid blocking cover, and an elastic element. The housing assembly defines a liquid chamber. The atomizing core is configured for atomizing the tobacco liquid. The lid is configured for sealing the liquid chamber, and is detachable from the housing assembly. The liquid blocking cover is movably arranged in the housing assembly. The elastic element elastically abuts against the liquid blocking cover. When the lid is connected with the liquid blocking cover, the lid is capable of driving the liquid blocking cover to move to a first position where the tobacco liquid in the liquid chamber can flow to the atomizing core. When the lid is detached from the housing assembly, the liquid blocking cover is driven by the elastic element to a second position where the atomizing core is isolated from the liquid chamber.
