COCAINE use among young people in Britain is on the rise after three years of decline, a survey showed last week. More than one fifth of 16 to 24 year-olds admitted using the drug once a month in the latest figures for 2005/2006 compared 17/2 per cent in 2003/2004, according to the European Union's drugs agency. Meanwhile, cannabis use in the UK has fallen from 46.9 per cent in 2003/2004 to 41.2 per cent.