Colorado health officials have confirmed six cases of vaping-related illness since the state announced its first case last month.
The Colorado Department of Public Health previously announced four known reports before confirming two more Wednesday.
Officials say the illness has hospitalized four in Colorado and is affecting mostly young people who reported vaping marijuana, nicotine or both.
Health officials continue to urge people to quit vaping until more is known about what is making people sick.
The illness has been identified in 530 people in 38 states and is being blamed in seven deaths.
Symptoms include coughing, shortness of breath, chest pain, and fatigue.