Demographic characteristics, use of other recreational drugs and performance on globally and locally defined targets (SEM between parentheses).

<p>Raven IQ, IQ measured by means of the Raven Progressive Matrices; Monthly drinks, monthly number of standard alcoholic drinks; Monthly cigarettes, monthly standard cigarettes smoked; Monthly exposure cannabis, monthly consumption of cannabis; Lifetime exposure MDMA, lifetime consumption of MDMA (ecstasy) tablets.</p>**<p><i>p</i><0.01.