Students using AI for mental health support have received harmful suggestions like cutting off all human contact. Classroom use is happening far more quickly than research into when AI is actually helpful:
https://theconversation.com/more-and-more-teachers-and-students-are-using-ai-even-though-it-might-do-more-harm-than-good-275650
https://theconversation.com/more-and-more-teachers-and-students-are-using-ai-even-though-it-might-do-more-harm-than-good-275650

More and more teachers and students are using AI – even though it might do more harm than good
Some new findings show that AI has certain benefits, such as reducing barriers for students with learning disabilities. But overall, more evidence is needed to understand how AI influences learning.