Two students at Butler Senior High School were taken to the hospital Tuesday when they “allegedly used vape pens and had adverse reactions.“

District superintendent Brian White sent a letter to parents and guardians of high school students following the incident, asking them to reinforce the dangers of vaping to their children. He said vaping devices may also contain additional substances which can be harmful to their users.

Like smoking or illicit drug use, students are not permitted to vape on campus, as per the student code of conduct. White also emphasized the negative effects of vaping in his email by listing several possible health risks.