Doctors are warning about the dangers of the "pass out" challenge.
Known as the American Dream, or the Choking game, it involves teens depriving themselves of oxygen to achieve a high which causes them to lose consciousness and faint.
The fad is gaining popularity among young people who film themselves and put the footage on social media sites.
But doctors are now warning of the risks which include seizures, brain damage and even death.
Last year a teenage boy was admitted to Temple Street Hospital after taking part in a challenge.
Parents are being advised to talk to their kids about the dangers of the practice.
