Method and apparatus to monitor secondary air injection and catalyst conversion efficiency. A first user interaction with a first set of information is detected. The first and second conductive layers are adhered to opposite sides of the flexible substrate and have a plurality of raised contact elements in registration with at least a subset of the holes. The at least one therapy is disabled when the therapy enabler token is decoupled from the patient support structure and the at least one therapy is enabled in response to the therapy enabler token being coupled to the patient support structure. The vaporizer includes a contact bed having an inert packing media for vaporizing the hydrophilic test chemical.