A personal vaporizing inhaler having an airway that is adjustable without disassembly of the vaporizer device. Such a vaporizer may include a hollow shell having an opening at one end ending in a mouthpiece, and having at least one air passage in the side of the hollow shell; a rotatable rotary air valve disposed within the hollow shell having an air passage that can be brought into alignment with the air passage of the hollow shell and at least one rotary valve connector, and a build deck having a heating element and at least one build deck connector configured to interface with the rotary valve connector such that rotating the build deck rotates the rotary air valve. The alignment between the air passages of the rotary air valve and the hollow shell may be adjustable in order to allow more or less air into the vaporizer.