State health officials say three cases of vaping-related respiratory illness have been identified in Arizona, all in Maricopa County.

The Department of Health Services said Tuesday the Arizona cases are part of an outbreak that has resulted in six deaths nationwide but none so far in Arizona.

According to the department, the people involved in all three cases in Arizona were hospitalized but have since been discharged.

The department urges that medical providers report suspected cases to the Arizona Poison and Drug Information Center

The federal Centers for Disease Control and Prevention says investigators haven't any specific substance or vape product linked to all cases.

However, the CDC says vaping devices containing both nicotine and cannabinoid substances have been identified in the investigation.