A portable vaporizer for the delivery of inhalable substances is presented that has the capability of combining multiple different cartridges to provide the user with a variety of inhalable substances for inhalation. Each cartridge may comprise a heating element, a chimney contact connector located at a first end of the cartridge, a distal contact connector located at a second end of the cartridge, and one or more electrical connections between the heating element, the chimney contact connector, and the distal contact connector.