THE ''Youth in Hongkong - A Statistical Profile (1992)'' report also carries data from the Central Registry of Drug Abuse, which shows an increase of 14.8 per cent in the number of newly reported young drug abusers under the age of 21 in 1991, compared with the previous year. The most common age group for initial drug abuse continued to be those between 15 and 24. Among newly reported persons under 21 years old, there have been significant changes in the type of drug abused in recent years. After having fallen from over 90 per cent in 1982 to 21 per cent in 1988, the use of heroin among drug abusers in this age group has increased in recent years and is the most popular drug of abuse. Almost half of newly reported young abusers took heroin. Cannabis was taken by just under a quarter (24.7 per cent) of young abusers. Abuse of cough medicine has grown from five per cent of cases in 1988 to over 20 per cent in 1991. Over 1,500 copies of the report have been printed and will later be distributed to public libraries and secondary schools.