Pupils are being offered support after an increase in children vaping and swearing at teachers post-Covid.
Staff at Carmarthenshire high schools said a rise in bad behaviour was putting significant strain on teachers.
Pupils said they had seen children as young as 11 vaping in schools, with "shocking" language hurled at staff.
Now every school in the county has a inclusion officer to work with pupils and parents to try to improve behaviour.
Teachers reported an increase in bad behaviour after pupils returned to face-to-face lessons, with head teachers writing to parents earlier this year urging them to talk to their children about their "detrimental behaviour".
