A portable hand-held vaporizer assembly that has a body shaped to fit substantially within a standard-sized clothing pocket with the body including an airflow chamber defining an airflow passage and having a proximal end and a distal end, opposite to the proximal end, defining a distal opening that places the airflow passage in fluid communication with an outside environment, the airflow chamber being at least partially encapsulated within the body. The body further having a convection-based heating element assembly with a heating element having a portion thermally coupled to the airflow passage, a herb placement zone in fluid communication with the airflow passage, and a conductive conduit that places the airflow passage in fluid communication with the outside environment, with a first position where a distal end of the conduit is substantially recessed within the body and second position where the distal end extends a length away from the body.