A vaporizer comprises a battery housing (100), a battery (120) housed within the battery housing, a cartomizer (200) connectable to the battery housing and including a cartomizer body (210) dimensioned to hold a vaporizable substance, and a heating element (240) operable to heat the vaporizable substance. The vaporizer further comprises a cutoff device connectable to the heating element and operable to disrupt the heating element.
