A pupil collapsed outside school grounds and was taken to hospital after puffing on a vape that had been laced with a potentially deadly synthetic drug. The teenager had just finished for the day at Herne Bay High when another youngster handed him the illegal device by the gates. But immediately after inhaling the pupil fell to the pavement. “The student became very unwell, very quickly, to the point he collapsed,” said principal Jon Boyes in a letter to parents. “Staff patrolling outside school managed to intervene, getting the emergency services to the scene very quickly where clinical inter…