An 18-year-old French girl had to be hospitalised when she developed scaly skin on her legs and hands, unsteadiness and 6mental sluggishness.

It was discovered that the girls had been using the mothballs as a recreational drug when doctors found a bag of mothballs stashed in her room while she was being treated at the Hospital of Timone in Marseille.

Both girls had been "bagging" - inhaling mothball fumes - after encouragement from classmates.

The twin who was sickest had also been chewing half a mothball a day for two months.