Children are buying super-strength vapes – equivalent to smoking 125 cigarettes – in a craze sparking health fears.

They are so powerful that young users have reported lengthy nosebleeds, coughing up blood, headaches, chest pains and dizzy spells.

More than 53,000 of the Geek Bars brand are sold every week in shops – up from around 2,000 in May – despite many having more than twice the legal level of nicotine, industry figures leaked to the Daily Mail show. 

Thousands more are believed to be bought online.