Rates of substance use among adolescents have increased in the 1990s, however little is known about current patterns of substance use among youths entering adulthood.
MRC Centre for Social, Genetic and Developmental Psychiatry, Institute of Psychiatry, King's College, POBOX 080 De Crespigny Park, SE5 8AF, London, United Kingdom. maria.melchior@st-maurice.inserm.fr