Pupils at a school in Highlands became seriously ill after drinking vaping fluid contained within electronic cigarettes.
Dingwall Academy has sent letters home with its students warning that the liquid is "highly toxic and can be fatal".
NHS Highland has issued a wider warning about the potential risks of the behaviour.
Signs someone has drunk the fluid include vomiting and dizziness.
Highland Council said letters went out to pupils' parents and carers on Friday.
A spokeswoman said: "We have had to deal with a small number of incidents over the last couple of days where pupils have become seriously ill in school.
"We believe that the illnesses may have been caused by individuals drinking vaping fluid, which is highly dangerous.
https://www.bbc.co.uk/news/uk-scotla...lands-46591746
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Can I have a wee nip of your vape Mr.