Final answer:
The vaporizer should be aimed at the client when they are prepared and comfortable, after any necessary pre-treatment steps have been completed and safety measures are in place.
Step-by-step explanation:
The question "When do you first aim vaporizer at client" appears to relate to a procedure in a beauty or health setting, such as esthetics or respiratory therapy, where a vaporizer might be used. Without more context, it's difficult to provide a precise moment for when to aim a vaporizer at a client. However, the general guidance would be that a vaporizer should be aimed at the client when the practitioner is prepared to begin the treatment, the client is comfortably seated or lying down, and after any pre-treatment preparations, like cleansing the skin or conducting a patient assessment, have been completed.
It is critical to ensure the vaporizer is clean, filled with the appropriate substance (like water or another therapeutic agent), and that the temperature and intensity of the vapor is set according to the client's needs and the treatment protocol. Notably, the client should be informed about the process and give their consent before the treatment starts. Safety measures must always be considered to prevent burns or discomfort caused by the vapor.